By Peter Duffett-Smith

The 1st version of this very winning e-book was once a winner of the Astronomical Society of the Pacific's "Astronomy ebook of the 12 months" award in 1986. the recognition of the book's courses is predicated at the ease with which the novice astronomer can practice calculations on a private laptop. The workouts are usually not particular to any make of desktop and are user-oriented in that they make the most of an easy model of the elemental programming language and require just a wide realizing of any specific challenge. Seven new subroutines during this re-creation will 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 subsequent sun eclipse seen from a specific position. in truth, nearly each challenge more likely to be encountered via the novice astronomer will be solved by means of an appropriate mix of the exercises given during this publication. Peter Duffett-Smith is the writer of one other well known astronomy ebook: Astronomy together with your Calculator (3rd Edition), additionally released by way of Cambridge collage Press.

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570796327-FNS(W) 30 35 40 45 PRINT PRINT PRINT PRINT 50 New latitude? 50 IF FL(4)=1 THEN GOTO 70 55 Yes-get v a l u e . . 65 . . and convert to decimal form with MINSEC 55 60 65 Q$="Geographical latitude (D,M,S; S neg. PRINT : PRINT Q$; : INPUT XD,XM,XS SW(1)=-1 : GOSUB 1000 : GP=FNM(X) 70 75 Which direction? 0) Q$="Declination (D,M,S) PRINT Q$ ; : INPUT XD,XM,XS SW(1)=-1 : GOSUB 1000 : Y=FNM(X) : X=XA 165 Call EQHOR and convert results to degrees 165 170 GOSUB 1500 : P=FND(P) IF SW=1 THEN GOTO 205 175 Print results...

Thus, the local civil time in time zone +4 hours is equal to U T + 4 , unless daylight saving is in operation when you will need to make a further correction of an hour or two. Subroutine TIME handles the complexities of all this for you. It will convert your local civil time into your local sidereal time, or the other way around, calculating on the way UT and SG. The direction of conversion is controlled by the switch SW(2), being from civil time to sidereal time when SW(2) = 1, and from sidereal time to civil time when SW(2) = — 1.

And time (H M S) Day of the week ? 00 Thursday Again (Y or N) ? Y Convert calendar date (Y or N) ... ) ... 1,11,0 ** no year zero ** *** impossible date Again (Y or N) 28 ? N 1300 TIME This routine converts a given local civil time into the local sidereal time and vice-versa, also calculating Universal Time and Greenwich sidereal time. The basis of all civil timekeeping on the Earth is Universal time, UT. It is a measure of time which conforms, within a close approximation, to the mean daily motion of the Sun.

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