 | United States Naval Observatory. Nautical Almanac Office - 1915 - 798 pages
...+0.9 30 | 0.824 50 176 62.3 -0.9 32 0.019 164 328 4.8 +2.3 FOB GREENWICH MEAN NOON. NOTATION. fc=the ratio of the area of the illuminated portion of the...of the entire apparent disk regarded as circular. t=the angle between the Sun and Earth, аз seen from the planet. 6=the angle which the line joining... | |
 | United States. National Bureau of Standards - 1928 - 852 pages
...only a portion of the illuminated disk is on the thermocouple receiver, X is taken equal to the ratio of the illuminated portion of the apparent disk to the area of the entire disk regarded as circular. Although this factor is somewhat uncertain it enters the equation as the... | |
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X is taken equal to the ratio of the illuminated portion of the apparent disk to the area of the entire disk regarded as circular. 