Question

What are three conditions needed for a total Solar Eclipse?

Answer 1

Necessary: 1. Moon has to be in-between the Earth and the Sun. 2. Moon's umbra should sweep your place. 3. Latitude and longitude of your place should be within the befitting limits. .

Explanation:

The band on the surface of the Earth swept by the Moon;s umbra might not exist. The vertex of the umbra might be above your head. Yet, there might be an annular eclipse during Earth-Moon-Sun alignment.
The very conducive condition is that the Moon's crossing of the ecliptic (called node), during the alignment for the eclipse, should be very close to the the line of centers E-M-S.
The maximum duration on record for a Total Solar Eclipse is about is about 14'. The favored band is therefore short and, of course, narrow.. .

Answer 2

Answer to the query: Firstly, the first is necessary but not sufficient.The second excludes annular eclipses. The third includes annular eclipses.

Explanation:

When there is a proximate alignment E-M-S of the centers, the vertex of the revolving Moon's umbra might be above, on or within the Earth, under the first condition. As the number of conditions is preset as three, I adhered to that.