Astronomy.

As the Earth passes on fromEast, through Libra, Scorpio, and

p»

S e '

And fines N S — 90°, we have c — 1 ; and fot £mi-diurnal Arch = 90°, x — 1 also ; therefore th (otis as b — 0,6225 — Co-sine of the Latitude, v 'j e r t ^the whole Day is 1,245, and' which is to that g,Equinoctial as if to 2 nearly. At the P°‘^ pol £ |therefore the Heat of an Equinoctial Day at this nothing. Lastly, in the Latitude of 60° * V'of such a Day is half that under the Equator, ° rcause then b — f Radius, .or 0,5. , B fr

24. In the next Place, let us calculate the H ea KSummer Tropical Day. Here we have the Tim® ss. c lstDay 8 Hours 12 Minutes nearly ; therefore th e .-^ethe Equator which passes the Meridian in that . cll rrir123 0 = z. And because when Radius is 1 th® ^ gscience is 6,28318, therefore fay. As 360 : 6, 25 ^ ^

: ~ 0'0I745Z29 *> ste Leng*

of

360

Arch z in the Measure of the Radiushave

The Logarithm of the Sine z = 123

The Logarithm-0,01745

-- a =51° 30'

- d - 23° 30

Th® 1 '

■efot e

Us

a of

The Logarithm ■The Logarithm •

■ 9 -

M 1

Ml

bo°‘

i

<0$’

Total, the Logarithm oiadz — 0,6698 ^ 9 '

25. Then for the other Part of the 'Vhz ° :Ci (Xb c, we have % S

The Logarithm of the Sine ^ — 57° oo'=^

The Logarithm- : — b = 38° 30^ == 9 '^-ss

The Logarithm —-—— c — 66° 30' ^

*

Total, the Logarithm of xbc — 0,4788 (r.

Therefore the Heat of half the Day is 0,66987" zl^,

l>b'

— 1,1486 ; and of the whole Day it is 2,297^jxhtwice as great as that of the Equinoctial ^' A \ 0 (z ^and greater than the Heat of such a Day to £

|ive under the Equator. gfc.