Hi Richard,
We may regard the value of the inclination of the analemma on the horizon,
in a given hour of solar time, equal to the angle between the intersection
of the hour plane -corresponding to that hour- and the horizon.
If we call with : a = this inclination; Lat = the latitude; H = the hour
angle= (12-hour)*15
we have the formula : Cos(a)=cos(Lat)*sin(H)
For instance :
With Lat = 30d with
Lat = 60d
Hour 12 H=0 90d 90d
Hour 15 H=45 52.2 69.3
Hour 17 H = 75 33.3 61.2
The figure attached is very poor for the limitation in the dimension of the
attached file : it shows the analemma at the hours 7 to 17 in places with
Latitude = 30d and 60d
Gianni Ferrari
[EMAIL PROTECTED]
Attachment converted: Macintosh HD:lat30_60.jpg (JPEG/JVWR) (000A6D5F)
