334
SYNOPTICAL TABLES.
{|style="width:100%;"
|+THE SUN |- |style="vertical-align:top;"|Volume (Earth's = 1), |style="vertical-align:bottom;text-align:right;"|1,415,225 |- |style="vertical-align:top;"|Mass (Earth's = 1), |style="vertical-align:bottom;text-align:right;"|354,936 |- |style="vertical-align:top;"|Density (Earth's = 1), |style="vertical-align:bottom;text-align:right;"|0.2543 |- |style="vertical-align:top;"|Diameter (Earth's = 1), |style="vertical-align:bottom;text-align:right;"|111.454 |- |style="vertical-align:top;"|Diameter in miles, |style="vertical-align:bottom;text-align:right;"|882,646 |- |style="vertical-align:top;"|Diameterapparent, mean, |style="vertical-align:bottom;text-align:right;"|32′ 12″.6 |- |style="vertical-align:top;"|Gravity at equator (Earth's = 1), |style="vertical-align:bottom;text-align:right;"|28 |- |style="vertical-align:top;"|In one second of time bodies fall, in feet, |style="vertical-align:bottom;text-align:right;"|335 |- |style="vertical-align:top;"|Period of rotation in days, |style="vertical-align:bottom;text-align:right;"|25.5 |- |style="vertical-align:top;"|Zone of maximum spots north from the equator, |style="vertical-align:bottom;text-align:right;"|11°—15° |- |style="vertical-align:top;"|Usual limit of spots from the equator, |style="vertical-align:bottom;text-align:right;"|33° |- |style="vertical-align:top;"|Period of maximum number of spots, in years, |style="vertical-align:bottom;text-align:right;"|10 |- |style="vertical-align:top;"|Diameter of maximum spot (Sun's = 1), |style="vertical-align:bottom;text-align:right;"|0.05 |- |style="vertical-align:top;"|Breadth of zone of drift, at equator, direction of rotation, |style="vertical-align:bottom;text-align:right;"|30° |- |style="vertical-align:top;"|Breadth of zone of drift,„ in each hemisphere, opposite direction, |style="vertical-align:bottom;text-align:right;"|30° |- |style="vertical-align:top;"|Light of the Sun (light of star of 1st Mag. = 1), |style="vertical-align:bottom;text-align:right;"|108,000,000,000 |- |style="vertical-align:top;"|Intensity of Sun's light (electric light = 1), |style="vertical-align:bottom;text-align:right;"|4 |- |style="vertical-align:top;"|Intensity of Sun's light : (wax candle = 1), |style="vertical-align:bottom;text-align:right;"|15,000 |- |style="vertical-align:top;"|Heat of each square foot of surface, mechanical effect, in horse-power, |style="vertical-align:bottom;text-align:right;"|7,000 |- |style="vertical-align:top;"|Heat of each square foot of surface, equal the combustion of cwts. of coals per hour, |style="vertical-align:bottom;text-align:right;"|13.5 |- |style="vertical-align:top;"|Heat of each square foot of surface, equal 5 lbs. matter falling with velocity per second, in miles, |style="vertical-align:bottom;text-align:right;"|390 |- |style="vertical-align:top;"|Heat at centre of disc (heat at border = 1), |style="vertical-align:bottom;text-align:right;"|2 |- |style="vertical-align:top;"|Diameter of largest spots, in miles, |style="vertical-align:bottom;text-align:right;"|50,000 |- |style="vertical-align:top;"|Number of strata in atmosphere, |style="vertical-align:bottom;text-align:right;"|4 |- |style="vertical-align:top;"|Spots seen to rotate on their axis (in days), about |style="vertical-align:bottom;text-align:right;"|18 |- |style="vertical-align:top;"|Heat equivalent to loss of mechanical force by Mercury falling into Sun (a year's heat of Sun = 1), |style="vertical-align:bottom;text-align:right;"|3 |- |style="vertical-align:top;"|Velocity of bodies near the Sun (miles per second), about |style="vertical-align:bottom;text-align:right;"|400 |- |style="vertical-align:top;"|Point in Hercules to which the Sun is advancing, declination 35° N., right ascension, |style="vertical-align:bottom;text-align:right;"|250° |}