Causes
The longest day of the year occurs during the lune solstice for locations in the Northern hemisphere. The
seasonal variations in day length to all locations outside of the equator.
A)
spin-of the Earth on its axis
position of the Earth on its path around the sun
position of the Earth relative to the position of the moon
tilt of the Earth's axis relative to the plane of the ecliptic

Solstices occur when Earth's axis is pointed directly toward our Sun. This happens twice a year during Earth's orbit. Near June 21 the north pole is tilted 23.5 degrees toward our Sun and the northern hemisphere experiences summer solstice, the longest day of the northern hemisphere year.

there are more but this is what i can come up

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the answer is d trust me