Our Solar System consists of spheres, the planets. These are the measures of their radios: 71,492 km
Jupiter, Saturn 60,268 km 25,559 km Uranus, Neptune 24,746 km earth 6,378 km 6,052 km Venus, Mars 3,397 km and 2,440 km Mercury.
A picture is more descriptive:
Jupiter, Saturn 60,268 km 25,559 km Uranus, Neptune 24,746 km earth 6,378 km 6,052 km Venus, Mars 3,397 km and 2,440 km Mercury.
A picture is more descriptive:
You have seen that the Earth is something "sickly" in comparison to the large system. Broaden the image of "small" 
astronomers, geographers, meteorologists ... all those working on Earth and other planets, must have knowledge of spherical geometry, hence its importance. The course comes in 3 ยบ ESO, we will study some of it. 
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