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finger down the column marked 2 we find the figure 1.0280 in line with the figure 15 in the minute column. That logarithm (1.0280) is the logarithm of interval.

The daily motion of each planet differs from the daily motion of all the other planets. Therefore the travel of each must be separately calculated and the logarithm of its motion found, but the interval between the G. M. T. and the nearest noon applies equally in the calculation of all the planets, so that once the interval has been ascertained, its logarithm may be used in the calculation of all the planets’ places.

Continuing our calculation, we place the—

Logarithm of the Sun’s motion from noon Aug. 2nd to noon Aug. 8rd (57 minutes)
Plus Logarithm of interval
Logarithm of distance traveled by the Sun during the interval

The value of that logarithm in degrees and minutes we ascertain by finding it or the logarithm nearest thereto in the table. In the present example the nearest logarithm is 2.4594. This figure is in the column marked 0 degrees at the top, and in line with the figure 5 in the extreme left-hand column which contains minutes. Therefore the value of the logarithm is 0 degrees 5 minutes. Thus we have obtained the same answer to our problem (When the Sun moves 57 minutes in 24 hours, how much does it move in 2 hours 15 min.?) by using logarithms as we did working by proportion. The latter method may seem