Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site calgary.UUCP Path: utzoo!decvax!harpo!whuxlm!whuxl!houxm!ihnp4!alberta!calgary!west From: west@calgary.UUCP (Darrin West) Newsgroups: net.astro Subject: Re: More on astronomical software Message-ID: <248@calgary.UUCP> Date: Mon, 12-Aug-85 12:12:50 EDT Article-I.D.: calgary.248 Posted: Mon Aug 12 12:12:50 1985 Date-Received: Thu, 15-Aug-85 01:09:52 EDT References: <1117@teddy.UUCP> Distribution: na Organization: University of Calgary, Calgary, Alberta Lines: 18 > In the most recent issue of "Astronomy" magazine, (August, 1985) there is > an article about plotting start maps with home computers. > > Dick Pierce If anyone else tried the program given in this article, please note that it is possible to speed the thing up by about 1/3 simply by putting the first two sin/cos calculations before the loop. They always give the same answer anyways. (They were observation point ra and dec calculations I think.) I wrote it in C on a Commodore 64 and typed in many stars from an observers handbook. It plots approx 10 to 15 stars per second, which according to the article would be very fast. Try compiling the code. Darrin West University of Calgary Computer Science.