David Sang and Darrell Hamilton Solutions for Chapter: Earth and the Solar System, Exercise 1: Exercise 24.1

The Earth’s rotation on its axis and also its rotation around the Sun are cyclical and periodic. State how long the Earth takes to rotate once on its axis.

The Earth’s rotation on its axis and also its rotation around the Sun are cyclical and periodic. State how long the Earth takes to orbit the Sun once.

Explain the observations that lead us to the conclusion that the Earth spins on its axis.

Explain the phases of the Moon.

The Earth orbits the Sun at an average distance of $1.5\times {10}^8 \mathrm{km}$ and the period of orbit is $365$ days. Calculate the average orbital speed of the Earth around the Sun. Express the result in $\raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{h}$}\right.$. Correct the answer to five decimal places.