“umbra”可以造什么句，umbra造句

2、umbra and penumbra of sunspot

4、This is a lighter area between the umbra and the edge of a shadow.

6、Partial solar eclipses occur when the Moon's penumbra touches Earth; partial lunar eclipses occur when the only part of the Moon passes through Earth's umbra.

1、last contact of umbra

5、This includes the continuous survey of umbra and penumbra of the sunspot.

3、a fringe region of partial shadow around an umbra.

7、During the eclipse, the best viewing in North America found the coppery lunar disc high in a cold winter sky, the Moon reddened by light filtering into the Earth's dark central shadow or umbra.