Sumerians developed all of the following EXCEPT _______________.
The duration of a lunar eclipse is longer than a solar eclipse.
Consider the following statements:
1. Solar eclipse occurs during a new moon.
2. Lunar eclipse occurs during a full moon.
3. During a total solar eclipse, the entire sun is invisible from all parts of the earth.
If part of the full moon passes through Earth's umbra, we will see a(n)