/a L E C T U R K XL

^ * "L Beginning of the Year, or Time

^ le ^ lln enters the Equinox, is thus

225

8 - The

lei * the ,

^Mined by Observation. Let A B C be Plate

^ A r ^° n oL the Equinoctial, and DBE

nj Ce of the Ecliptic; then with a very * S ' 24

Qf instrument take the Meridian Altitude

E . Sun, the Day before and after the

:%ir

^UcJ 110X5 the Difference between these Al-tl le ^ and that of the Equator will be

tvbj, u n s Declination on those two Days*C * suppose to be AD and EC; which*-stus known and the Angle of Obli-

y A BD = E BC — 9

~ — ^.3 9 2q^ we find

re st D B and E B ; and therefore wek ^ s L B -|- E B is to D B, so is 24 Hours® Lime between the first Observation^)n; Moment of the Sun’s Ingress to theal Point B.

^ 4u ' r the Quantity of the Tropicalbetter defined from a Calculation

the

is

6 bdoments of the Solstices.

- - The In-t

*W * !°^ ^'bdoh curious and most certainu ^ owing to our late celebrated; and is founded on an easy Ob-* an ^ therefore practicable by anyut moderately {killed in the Con* '

m 4v o

e trv. ihg Method is as follows :represent a small Portion of the

Si

'QY vhi

> v kji

Fig.

ich the Ecliptic K V M touchesPoint V. Suppose the Sun

CL at