“The meridian was obtained by two different methods applied several times, the results agreeing very closely. Readings of azimuths and altitude of sun were taken between three and four hours after noon, corrected for semi-diameter, &c., and the true bearing obtained with the aid of the latitude and the declination given in Nautical Almanac (corrected for time).

“With regard to the elevations of the horizon, the existence of trees on or just below the sky-line renders readings to the nearest minute uncertain. In all cases I have tried to give the most probable value, supposing the trees to be absent. In some places the heights will have altered slightly during recent years owing to the construction of railways.

“The values given are the means of observations. They are not corrected for height of instrument above ground, which might increase the angles by about 5 mins. Trees on the sky-line appear to make a difference of some 35 mins.”

The azimuths as found by Mr. Morrow and myself are as under:

Height of horizon
(excluding trees).
Morrow.Lockyer.Morrow.
[23]From centre of great circle to Hauteville’s quoitN.17° 59′E.17°2° 23′
From centre of great circle to N.E. circle 53°  0′ 51°1°  5′
From centre of great circle along great circle avenue68° 43′65°0° 38′
From centre of N.E. circle along N.E. circle avenueS.83° 52′E.79°1° 40′
From centre of S.W. circle to centre of great circleN.19° 51′E.20°1° 44′

The azimuths to which I first direct attention are these:

Az.
Great circle to quoitN. 17° E.
S.W. circle to great circleN. 20° E.

These azimuths indicate that at Stanton Drew as at the Hurlers and elsewhere we are dealing with Arcturus as a clock-star. The facts are:

Az.N. Decln.Height of hills.Star.Date.
N. 17° E.38° 59′  0″2° 23′Arcturus1690
20°37° 26′ 50″1° 44′„1410

One of the greatest differences between Mr. Morrow’s local observation and my reading of the 25-inch Ordnance map occurs in the case of the direction of the avenue from the great circle. It may be suggested that the use of this avenue was to observe the May and August sunrises of the May year. If we take the sun’s declination at 16° 20′ N., see [p. 22], the azimuth should be about N. 64° E.; this is 1° from my value and 5° from that given by Mr. Morrow, but it must not be forgotten that the choice of a day in May and August slightly differing from the normal date might easily produce such a variation.