a)The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
b) Moon is seen to be of $$(1/2)^2$$ diameter from the earth. What must be the relative size compared to the earth?
c)From parallax measurement,the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.