Question

The Sun's declination is 0° at the _________. A. summer and winter solstice B. summer and winter equinox C. vernal and autumnal solstice D. vernal and autumnal equinox

Answer 1

The sun's declination is 0 degrees at the vernal and autumnal equinox hopefully this helps!

Answer 2

-- "Declination zero" means the object is in the sky at some point directly over the Earth's equator.

-- If it's the sun and it appears to be over the equator, then that tells us that the Earth's axis is not tilted toward or away from it.

-- That in turn tells us that the Earth is at one of the two equinoxes in its orbit, either the Spring one or the Autumn one. (D)

-- (The first days of Summer and Winter coincide with solstices, not equinoxes.)