About the work

A closer look.

Name one place and one morning. You get the real moment first light lands there, corrected for elevation and the local horizon. What you receive: the on-location first-light minute and the app's sea-level table time, both named; the elevation from a named source; the horizon angle along the sunrise azimuth; the correction and where it is uncertain; one revision if the forecast flips your plan. Why it matters: a quoted sunrise time assumes a flat horizon at sea level. On a ridge the horizon dips below level and first light lands early; in a valley the ground blocks it and it lands late, by minutes. If you can't scout the spot yourself but you still need the right minute, this is for you.