On some astrolabes, a clocklike hand known as the rule, marked with declinations from -30 degrees to +70 levels, lay on prime of all the pieces. A pin passed by the middle of the instrument, holding all of the items…
On some astrolabes, a clocklike hand known as the rule, marked with declinations from -30 degrees to +70 levels, lay on prime of all the pieces. A pin passed by the middle of the instrument, holding all of the items…