PHYSIOGRAPHY. 91 



The Lunar or Metonic cycle after which new moons fall on the 

 same days of the year (235 lunations) is 6939*6876 days or nearly 

 19 years. In 1894 the Golden Number is XIV. 



The Julian period, after which the solar and lunar cycles and the 

 Roman Indiction recur, is (28 x 19 x 15) 7980 years, of which the 

 first was 4713 B.C. (1894 is the 6607th). 



YE A us OF THE JULIAN PERIOD. 



Year 1 of the Jewish Era (Oct. 7th) 9,^3 



1st Olympiad (July 1st) 3938 



Foundation of Rome 3961 



Egyptian Era (Feb. 26th) 3967 



Christian Era 4714 



Hegira (July 16th) 5335 



French Republic (Sept. 22nd) 6505 



January 1st, 1894, is the 2,412,830th day of the Julian Period. 



(116) ELEMENTS OF THE SOLAR SYSTEM. 



The Constant of Aberration is 20"'4451. 



The mean obliquity of the Ecliptic is 23 27' 1 0"'89 on Jan. 1st, 

 1894, and the mean annual diminution is 0"'476. 



The Equatorial Horizontal Parallax of the Sun at the Earth's 

 mean distance is 8" '848. 



North declination of a Ursae Minoris (Pole Star) for Jan. 1st, 

 1894, is 88 44' 55"'3 with an increase of nearly 16"'5 per annum. 

 Hence the Pole star is about 1 15' from the celestial pole. 



Solar radiation falling on the top of our atmosphere 25 calories 

 per sq. m. or 9 '21 British units per sq. foot per minute. 



(See over. ) 



