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What is the highest altitude listed below at which the sun will reach an altitude of 90° above the horizon at some time during the year?
0 °
45
66
23
23°
Assuming mid-lattitudes (40-50 N/S). at which time of the year is the relationship between length of day and night, as well as the rate of change of declination of the sun, changing at greatest rate?
Summer solstice and spring equinox
Spring equinox and autumn equinox
Summer solstice and winter solstice
Winter solstice and autumn equinox
The angle between the plane of the equator and the plane of the ecliptic is
66.5 deg
23.5 deg
25.3 deg
65.6 deg
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