The zenith and nadyr of a Star cluster is basically the
angle of inclination relative to a certain pre-determined
horizontal line on earth. This angle(normally stated
in rads or arcs of a degree) oscillates from a low point
in the horizon to a high point in the horizon.
And what the hell is the BIg Dipper?
I need the scientific name of the star cluster not
the "popular" one.
If I were to venture a guess, as the earth rotates around its
axis, the different seasons emerge. The earth also rotates around
the sun. So, what you get is a vector summation of two
different angular velocities relative to one another(the
sun and the earth).
The difference between high and low HAS to be 6 months
because the earths rotational motion will obscure the
star cluster from view.
So, Moneybags is right in his month differential.
So, Prince of a guy you need to specify a SPECIFIC
geographical location.
Fonz