Eclipse geometry (Earth’s curvature ignored) with respect to location (A) and solar zenith angle (B). (A) Effect of eclipse geometry on the altitudinal position of the umbra at three different locations at the same time. (B) Effect of eclipse geometry on the altitudinal extension of the umbra above a certain location at three different solar zenith angles (60°, 30° and 10°). Note that we refer to the zenith angle as measured at (the centre of) the intersection and not at ground level.