Whats is the importance of hemispheres?

1 Answer
Mar 24, 2016

Importantly, most of the stars and planets are nearly spherical. At any instant, only a hemispherical surfaces face each other. The other halves are hidden..


In a star system, most of the planets spin for day and night. At any instant, the star-facing hemisphere is starlit for day, and it is night for the hidden hemisphere.