The three necessary conditions for an annular solar eclipse are:
-
Moon in new moon phase. - This is necessary because the moon must be between the Earth and the Sun.
-
Moon in apogee orbit. - This is necessary because the moon must be farther away from the Earth than usual, which causes it to appear smaller in the sky than the Sun, leading to the ring-shaped appearance during an annular eclipse.
-
Moon moves in a direct line between Sun and Earth. - This is required for any type of solar eclipse, as the moon must be positioned directly between the Earth and the Sun.
The other options:
- Moon in perigee orbit is not a condition for an annular solar eclipse, as that would mean the moon is closer to the Earth and would not cause an annular eclipse.
- Moon in full moon phase is also not a condition for a solar eclipse since a full moon occurs when the Earth is between the Sun and the Moon, not the other way around.
Therefore, the correct selections are:
- Moon in new moon phase.
- Moon in apogee orbit.
- Moon moves in a direct line between Sun and Earth.
1 answer