24 hrs; depends on the season
24 hrs; 24 hrs
12 hrs; 12 hrs
24 hrs; 12 hrs

There was a total eclipse of the Sun on August 21, 2017, that crossed much of the United States. Which one of the answers is NOT one of the requirements for a TOTAL SOLAR eclipse?

The Moon-Earth-Sun must be precisely aligned.
The Moon must be on one of the lunar nodes.
The Moon needs to be in its “new” phase.
The Moon needs to be in its “full” phase.

Here is a figure (Figure 3) of the Earth with various locations on the celestial sphere
labeled. The line “C to B” represents the rotation axis of the Earth. “A” is the location of
the Sun when it is 23.5 degrees below the celestial equator; “D” is the location of the
Sun when it is 23.5 degrees above the celestial equator. Match the labeled location with
the description and assume you live in the northern hemisphere.
A
B
C
D

Winter solstice
South celestial pole
North celestial pole