Das Gradnetz der Erde ist wie ein unsichtbares Koordinatensystem, das... Show more
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Updated Mar 16, 2026
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Gradnetz, Zeitzonen und Beleuchtungszonen verständlich erklärt
Das Gradnetz der Erde
Stell dir vor, die Erde wäre von einem riesigen Netz überzogen - genau das ist das Gradnetz! Es besteht aus zwei verschiedenen Linienarten, die sich überall auf der Welt kreuzen.
Breitenkreise sind wie Ringe um die Erde gelegt. Sie verlaufen alle parallel zueinander, haben aber unterschiedliche Längen. Der Äquator ist der längste mit 40.000 km und teilt unseren Planeten in Nord- und Südhalbkugel. Von dort aus zählst du jeweils 90 Breitenkreise nach Norden und Süden.
Längenkreise (auch Meridiane genannt) sind dagegen alle gleich lang und führen über beide Pole. Der Nullmeridian ist der Startpunkt - von ihm aus gibt es jeweils 180 Meridiane nach Osten und Westen. Dort, wo der 180. Längengrad ist, verläuft die Datumsgrenze.
Merktipp: Breitenkreise sind wie Gürtel (unterschiedlich breit), Längenkreise wie Orangenscheiben (alle gleich groß)!
Die Beleuchtungszonen entstehen, weil die Erdachse um 23,5° geneigt ist. Dadurch treffen die Sonnenstrahlen verschiedene Bereiche unterschiedlich stark: In den Tropen scheint die Sonne fast senkrecht, in den Polarzonen nur flach oder gar nicht. Die Mittelbreiten liegen dazwischen und haben deutliche Jahreszeiten.
Zeitzonen verstehen
Du kennst das sicher: Wenn du Verwandte in einem anderen Land anrufst, ist dort eine ganz andere Tageszeit! Das liegt daran, dass sich die Erde um sich selbst dreht - diese Rotation sorgt für Tag und Nacht.
Die Entstehung von Zeitzonen ist eigentlich ganz logisch: Da die Sonne immer nur eine Seite der Erde bescheint, haben Orte auf verschiedenen Längengraden unterschiedliche Ortszeiten. Ohne Zeitzonen hätte jede Stadt ihre eigene Zeit - das wäre total chaotic!
Deshalb wurde die Erde in 24 Zeitzonen aufgeteilt. Alle 15 Längengrade (360° ÷ 24 = 15°) gibt es eine neue Zeitzone mit einer Stunde Unterschied. Die Grenzen werden oft an Staatsgrenzen angepasst, damit nicht mitten durch ein Land verschiedene Zeiten gelten.
Eselsbrücke: 15° = 1 Stunde Zeitunterschied. Im Osten ist es früher, im Westen später!
An der Datumsgrenze bei 180° Längengrad wechselt sogar das Datum. Wenn du diese Linie überquerst, springst du einen ganzen Tag vor oder zurück - ziemlich verrückt, oder?
We thought you’d never ask...
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You can download the app from Google Play Store and Apple App Store.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Gradnetz, Zeitzonen und Beleuchtungszonen verständlich erklärt
Das Gradnetz der Erde ist wie ein unsichtbares Koordinatensystem, das uns hilft, jeden Punkt auf unserem Planeten genau zu bestimmen. Dieses System aus Breitenkreisen und Längenkreisen erklärt auch, warum wir verschiedene Zeitzonen haben und weshalb es am Nordpol im Winter... Show more
Das Gradnetz der Erde
Stell dir vor, die Erde wäre von einem riesigen Netz überzogen - genau das ist das Gradnetz! Es besteht aus zwei verschiedenen Linienarten, die sich überall auf der Welt kreuzen.
Breitenkreise sind wie Ringe um die Erde gelegt. Sie verlaufen alle parallel zueinander, haben aber unterschiedliche Längen. Der Äquator ist der längste mit 40.000 km und teilt unseren Planeten in Nord- und Südhalbkugel. Von dort aus zählst du jeweils 90 Breitenkreise nach Norden und Süden.
Längenkreise (auch Meridiane genannt) sind dagegen alle gleich lang und führen über beide Pole. Der Nullmeridian ist der Startpunkt - von ihm aus gibt es jeweils 180 Meridiane nach Osten und Westen. Dort, wo der 180. Längengrad ist, verläuft die Datumsgrenze.
Merktipp: Breitenkreise sind wie Gürtel (unterschiedlich breit), Längenkreise wie Orangenscheiben (alle gleich groß)!
Die Beleuchtungszonen entstehen, weil die Erdachse um 23,5° geneigt ist. Dadurch treffen die Sonnenstrahlen verschiedene Bereiche unterschiedlich stark: In den Tropen scheint die Sonne fast senkrecht, in den Polarzonen nur flach oder gar nicht. Die Mittelbreiten liegen dazwischen und haben deutliche Jahreszeiten.
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Zeitzonen verstehen
Du kennst das sicher: Wenn du Verwandte in einem anderen Land anrufst, ist dort eine ganz andere Tageszeit! Das liegt daran, dass sich die Erde um sich selbst dreht - diese Rotation sorgt für Tag und Nacht.
Die Entstehung von Zeitzonen ist eigentlich ganz logisch: Da die Sonne immer nur eine Seite der Erde bescheint, haben Orte auf verschiedenen Längengraden unterschiedliche Ortszeiten. Ohne Zeitzonen hätte jede Stadt ihre eigene Zeit - das wäre total chaotic!
Deshalb wurde die Erde in 24 Zeitzonen aufgeteilt. Alle 15 Längengrade (360° ÷ 24 = 15°) gibt es eine neue Zeitzone mit einer Stunde Unterschied. Die Grenzen werden oft an Staatsgrenzen angepasst, damit nicht mitten durch ein Land verschiedene Zeiten gelten.
Eselsbrücke: 15° = 1 Stunde Zeitunterschied. Im Osten ist es früher, im Westen später!
An der Datumsgrenze bei 180° Längengrad wechselt sogar das Datum. Wenn du diese Linie überquerst, springst du einen ganzen Tag vor oder zurück - ziemlich verrückt, oder?
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
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4.7/5
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user