I really really need help with astronomy!!?

[pinkygirl]

I need help with astronomy...
I was doing my assigments. I finished some questions but there are still some questions I couldn't find the answers. Could someone help me? It would be nice if you could explain the answers too. Thank you.

*The Moon lies roughly 384000 km from Earth and the Sun lies 150000000 km away. If both have the same angular size as seen from Earth, how many times larger than the Moon is the Sun?

I think the answer is 3.90625....but i'm not sure if it's correct
*What angle would Eratosthenes have measured had Earth been flat?

*Given that the angular size of Venus is 57 '' when the planet is 44000000 km from Earth, calculate Venus's diameter (in kilometers).

* The Last Quarter phase of the moon

1)rises at sunrise
2)sets at sunrise
3)crosses the meridian at sunrise
4)sets at sunset
rises at sunset

[interstellaryeller]

Originally Posted by pinkygirl

I need help with astronomy...
I was doing my assigments. I finished some questions but there are still some questions I couldn't find the answers. Could someone help me? It would be nice if you could explain the answers too. Thank you.

*The Moon lies roughly 384000 km from Earth and the Sun lies 150000000 km away. If both have the same angular size as seen from Earth, how many times larger than the Moon is the Sun?

I think the answer is 3.90625....but i'm not sure if it's correct
*What angle would Eratosthenes have measured had Earth been flat?

*Given that the angular size of Venus is 57 '' when the planet is 44000000 km from Earth, calculate Venus's diameter (in kilometers).

* The Last Quarter phase of the moon

1)rises at sunrise
2)sets at sunrise
3)crosses the meridian at sunrise
4)sets at sunset
rises at sunset

3 crosses the meridian at sunrise

[Michael Steen]

For how many times larger the sun is than the moon, you may want to shift that decimal point a couple of places.