By Peter Duffett-Smith
The 1st version of this very profitable ebook used to be a winner of the Astronomical Society of the Pacific's "Astronomy e-book of the yr" award in 1986. the recognition of the book's courses relies at the ease with which the novice astronomer can practice calculations on a private laptop. The workouts will not be particular to any make of machine and are user-oriented in that they make the most of an easy model of the elemental programming language and require just a wide figuring out of any specific challenge. Seven new subroutines during this new version may be associated in any mix with the prevailing 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 realm at any time sooner or later or previous, or they're used to discover the circumference of the following sun eclipse obvious from a selected position. actually, virtually each challenge more likely to be encountered through the novice astronomer should be solved through an appropriate blend of the exercises given during this publication. Peter Duffett-Smith is the writer of one other well known astronomy publication: Astronomy along with your Calculator (3rd Edition), additionally released by means of Cambridge college Press.
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Extra info for Astronomy with your Personal Computer
Y Calendar date (D,M,Y; BC negative) .. 23,11,0 ** no year zero ** *** impossible date Again (Y or N) ? Y Calendar date (D,M,Y; BC negative) .. 5 -2415020 Julian date 0 Again (Y or N) 20 ? 5 into the calendar date (the inverse function of JULDAY). The result of an astronomical calculation is sometimes an instant of time, expressed as a number of days since a fundamental epoch. 5, and the number of days elapsed since then is represented by the real variable DJ. 69, but unless we are familiar with the interpretation of such numbers, the result will not mean very much to us.
94 ? 77 Again (Y or N) ? Y Same place (Y or N) ? ) ... 82 Equatorial to horizon (Y or N) ? Y Hour angle (H,M,S) Declination (D,M,S) Azimuth (D,M,S; N=0) Altitude (D,M,S) Again (Y or N) Same place (Y or N) ? 2 ? 72 ? Y ? 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.
FL(3) is set to 1 by TIME. Subsequent calls to TIME for the same date with FL(3) = 1 by-pass calculations which change only with the date, and hence speed up the process. Error flag ER(2) is set to 0 by the routine if SW(2)= — 1 and if the conversion is unambiguous. When an ambiguous conversion occurs, ER(2) is set to 1 and an error message is displayed. ER(2) is not affected if SW(2)= 1. Other routines called: MINSEC (1000), JULDAY (1100). 33 1300 TIME Notes 1 2 9 7 REM 1298 REM 1299 REM 1300 Called before for this date ?
Astronomy with your Personal Computer by Peter Duffett-Smith