[Larger diagram]

Fig. 50.—Place of first appearance of the May sun, in British latitudes.

Vertical axis: N. LAT. From bottom: 48-59.

Horizontal axis: AZIMUTHS. From left: 55-67.

Curves, from left: HORIZON, 0° HILL, 2°HILL.

The exact azimuths for this sunrise in the Land’s End region (Lat. 50°) in relation to the place of the sunrise when half the sun has risen, with a sea horizon, are shown in [Fig. 51].

Fig. 51.—Showing the influence of the height of the sky-line on the apparent place of sunrise in May and August. The double circle shows the tabular place of sun’s centre.