By Peter Duffett-Smith
The 1st version of this very winning ebook was once a winner of the Astronomical Society of the Pacific's "Astronomy publication of the yr" award in 1986. the recognition of the book's courses relies at the ease with which the beginner astronomer can practice calculations on a private machine. The exercises usually are not particular to any make of machine and are user-oriented in that they make the most of an easy model of the fundamental programming language and require just a wide knowing of any specific challenge. Seven new subroutines during this new version should be associated in any mixture with the present twenty-six. because the courses themselves look after info, they are often used, for instance, to calculate the time of emerging of any of the planets in any a part of the area at any time sooner or later or earlier, or they're used to discover the circumference of the following sunlight eclipse seen from a selected position. in truth, virtually each challenge prone to be encountered via the beginner astronomer might be solved via an appropriate blend of the exercises given during this e-book. Peter Duffett-Smith is the writer of one other renowned astronomy e-book: Astronomy together with your Calculator (3rd Edition), additionally released by means of Cambridge collage Press.
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Additional resources for Astronomy with your Personal Computer
Y Equatorial to horizon (Y or N) Horizon to equatorial (Y or N) ? N ? Y Azimuth (D,M,S; N=0) Altitude (D,M,S) Hour angle (H,M,S) Declination (D,M,S) ? 99 ? 10 Again (Y or N) What ? Again (Y or N) ? W ? N 43 1600 HRANG This routine converts the right ascension into the hour angle, and viceversa, given the Greenwich sidereal time and the geographical longitude. ) The problem of converting between the hour angle and the right ascension of a celestial object at a given local sidereal time is so straightforward as to make it hardly seem worthwhile devoting a separate subroutine to it.
You also need to declare your geographical longitude in degrees in GL (W negative), your time zone in TZ (W negative), and the number of hours added for daylight saving time in DS. For example, to make the calculation on 22nd August 1988 in the UK when British Summer Time was in operation, on longitude 5° W, you would set DY=22, M N = 8 , YR=1988,GL=-5,TZ=0andDS=l. ««-! Oh Oh 03m 56s 14h 00m 49s 14h 04m 45s April 22nd 23h 56m 04s **•—23rd—^ i Oh 14h 00m 49s 14h 04m 45s Figure 1. UT and SG for 22nd April 1980.
The routine given here converts between azimuth/altitude and hour angle/ declination. The equations are symmetrical in the two pairs of coordinates so that exactly the same code may be used to convert in either direction, there being no need to specify the direction with a switch. You would use this t Note that some authors use the south point of the horizon as reference. 37 1500EQHOR routine, for example, tofindwhere to look for the planet Mars in the sky having calculated its hour angle and declination.