Longitude changes only your local time - UT offset. Planispheres
usually are operated on local time, so the only thing to keep in mind is
daylight savings. Planispheres usually don't include correction for it,
so use local standard instead of local daylight. Latitude makes a
difference in where the horizon lines are and the apparent height,
north-south of things. A lot of planispheres are laid out for 40
degrees North. If your's is, then 3 degrees off isn't going to be
terribly noticeable. If your planisphere was laid out with London in
mind, at 51 North, then it's going to be off a fair bit. The errors
having to do with latitude are only regarding the horizon lines. The
north pole is still the north pole and stars still go around it. Star
maps usually don't have horizon lines, so they are independent of
latitude. The big change is for you to get used to seeing things
shifted 14 degrees, including seeing more southerly constellations that
you never saw from London, and having to say goodbye to some of your
circumpolar friends part of the year.

The obnoxious thing about living away from the prime meridian is that
when an event happens at a particular time, and is listed in UT, you
have to do the addition or subtraction to get to your local time. Then
there is the daylight savings boondoggle to figure in on top.

Hope you enjoy Sevilla.


monje380 wrote:
>
>
> Can anyone tell me if my lat and long will make any difference to my
> planisphere . My location 37.17.402n 05.23.246 , all of my books maps
> etc are based on my previous location which was london.
>
> _




> _,_._,___


--
Mark Holm
markholm@...
holmmarkd@...