Light through the day
Lines on the map point where the sun and moon sit on the horizon; the shaded wedge is the sun's whole arc across today's sky.
Terrain samples real hill heights around you and draws them as a silhouette on the arc — where the sun dips behind it, you're in shadow, so first/last light shift to when the sun clears the ridge.
Golden ≈ sun −4° to +6°, blue ≈ −6° to −4°. Times in your device timezone. Imagery © Esri · elevation SRTM.