|
I tried to recover my little moon eclipse sequence from before the tripod blew over but I gave up.
The eclipse curves over because the umbra is not falling on a static plane but on a surface which is rotating into view in a different plane to the earth rotation and orbit combined. The moon appears to us to be going straight over but in relation to the sun it is receding into the pointy end of the umbra.
The time period of the movement of the umbra on the moon , not the umbra itself against the stars, is varying constantly . Check an eclipse animation zoomed on to the moon like the one on Stellarium hour by hour with ecliptic lines and equatorial lines and you can see the path.
|