Why does the sun rise and set at different times everyday?
It is due to the tilt of the earth’s axis.Because of the tilt,there is an apparent movement of the the sun between the tropic of cancer in the Northern Henisphere and tropic of capricon in the southern Hemisphere.Further the Northern hemisphere is exposed fully to the sun on 21st June, causing summer season in the Northern Hemisphere and winter season in the southern Hemisphere.On 22nd December,The Southern Hemisphere is exposed to the sun causing summer there and winter in the Northern Hemisphere. If the axis of earth does not have a tilt as it is now and if it were to be perpendicular to the plane of revolution of the earth around the sun,the day time and night time will be equal in all the places throughout the year.In that case the sun rise time and sun set time will also be the same thoughout the year in all places of the earth.
