463

= log. tan. 14° 31' 28";the true anomaly = 29° 2' 56".

The difference of the mean and true anomalies, or, as it iscalled, the Equation of the Centre, equals 57' 4"*

If the eccentricity had been assumed = .016813, or .Ol6791»

* e equation of the centre would have resulted — 56 46 .4, or^ 4l".4 j respectively.

Example II.

Instead of .01691, suppose the Eccentricity of the Earth 's Orbit betoken at .016803*, and the Mean Anomaly, reckoning fromPer ‘gee, according to the Plan in the new Solar Tables, beW 12° 22' 12".4.

Taking out 6 signs, we have the mean angular distance from

a P°gee = 4» i2° 22' 12".4.

^ lo g- tan. 66° ll' 6".2 10.3552029

lo g- -983197. 7.9926406

ar *th. comp. .1016803 1.9927645

10.3406080 = log. tan. 65° 27' 56".4.

^■HiCEM-CME) 65° 27' 56".4 ^

i(C EM+CME) 66 ll 6.2

131 39 2.6 approx*, value of CD A (u)

log. ta n> “ or i G g > tan. 65° 49' 3l".3 •••«•• 10.34786402

1 , ... 4.9963203

2 log. .983197 ... Lnonfi

2 arith. comp. 1.06803 . 4-99

log. tan. I . 10.3405659;

2

.• - = 65° 27' 49"-2, and v = 4 s 10° 55 S8 .4 ,

2 ___ _ ---

* In 1750, the eccentricity was 0.016814, and, * e se ^ la f wb ich.000045572, in 1800, it was 0.016791, and m 1810, 1

e Poch Delambre’s Tables are constructed) .0167800.