|
|
From: Fred Hebard (no email)
Date: Sat Oct 23 2004 - 00:05:36 EDT
Bill,
Here is a graph of altitude versus time for meridian altitudes that
vary from 15 to almost 90 degrees.
The non-linearity is greatest in the graph for 75 degrees, and you can
see that it's a pretty straight line by 50-75 minutes after passage.
The non-linearity is less at 60 degrees but extends up to 100 minutes
after passage. By 45 degrees, the curve is almost imperceptible, but
of course there (otherwise the sun could never rise or fall!).
At meridian passages of 90 degrees you can see the sun goes straight
up, then straight down; my mistake the other day was looking at that
curve rather than one a bit lower, such as 75 degrees.
These curves show the sun going down after meridian passage. The
curves for it going up before passage are mirror images extending to
the left on the graph.
Fred
|