o find the time rations.of day, from the observed altitude of the sun, together ivith itspolar distance, and the latitude of the observer. Rule 1.—Add together the altitude, latitude, and polar dis- Practicaltance, and divide the sum by two. From this half sum subtractthe altitude, reserving the… … 240 ASTRONOMY. Chap- t- these four logarithms together, and divide the sum fo} two; theresult is the logarithmetic sine of half the hourly angle. 3.—This angle, taken from the Tables, and converted intotime at the rate of four minutes to one degree, will be thetime from apparent noon; the equation…
Astronomy
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