around every 30 days.
Approximately 28 1/2 days.
The same as Earth - Earth and Moon orbit the Sun together.
Sort of. The definition of a month is one moonth ... one lunar cycle.
The Earth takes approximately 365.25 days to complete one orbit around the Sun, which is known as a year.
the earth takes 365 1/4 days to orbit the sun . :)
Approximately 28 1/2 days.
No. The moon orbits the Earth which orbits the Sun.
90 days and 2 sec
There is no 'phrase' or mnemonic for this because the order of the Sun, Earth and Moon changes as the Moon orbits the Earth. Remember - planets obit a star (the Sun is a star) - Earth is a planet moons orbit planets - The Moon is a moon.
29.5 Earth years.
NO
It is an ELLIPSE. The Sun is NOT at the centre of the ellipse, but at one on the foci. Not only is the orbit elliptical , but this ellipse over time fattens ( becomes nearly circular) , or becomes a very narrow ellipse. The foci ( plural of the noun 'focus'), are two points inside the ellipse, on the major axis, where is you draw an ellipse with pins paper and string, are the two points were the pins are inserted. This ellipse does not quite close up. Each year there is a slight overlap in the orbited track . This has been observed with Mercury's orbit. Because the Sun is at one of the foci , the Earth's orbital track , speeds up near the Sun and slows down furthest away from the Sun. Also Equal Arcs of this orbit are swept in equal times. Have a look in Wikipedia , under ' Johannes Keppler ' .
The same as Earth - Earth and Moon orbit the Sun together.
1957
Yes. That and the the fact that the earth revolves around the sun. Those two things. If the earth was not tilted with respect to its obit, there would be no seasonal change.
28 days
687 earth days