Each dot is the position of the Sun or Earth at one time step in the time window, as
seen from the selected point. Left to right is the compass direction (azimuth). Bottom to
top is the angle above the horizon (elevation). The large dots show the time on the
clock.
The time window is 30 days from the start. For a longer period, a time strip shows
below the plot. The box on the strip is the time window. Drag the box to move it. Use
the mouse wheel on the strip, or the − and + buttons, to change its length. Click
the strip to move the box there. "Full period" shows all time steps. When the clock
leaves the window, the window moves with the clock.
At a terrain point, the brown terrain outline is the horizon. A dot above the
outline is visible. A dot below the outline is hidden by the terrain, also when it
is above the dashed 0° line. At a point without terrain data, the dashed 0° line is
the horizon.
"Earth is down" means that Earth's centre is below the local horizon: below the
terrain outline, or below 0° at a point without terrain data. The top edge of
Earth can still show.
When you zoom in, the Sun and Earth show as disks of their true size (Sun about
0.53°, Earth about 1.9°). The terrain hides the part of a disk below the horizon
outline. "Around the Sun" and "Around Earth" use the same scale on both axes.