3 January 2019 — 0832 mst

Starting Sunday, the sun begins rising earlier

Today is the antepenultimate day of the year’s latest sunrise. At Flathead Electric’s Stillwater Station, the calculated time of sunrise is 0828 MST. The calculation assumes the horizon is flat, so the sun doesn’t appear over the mountains until a few minutes later. Come Sunday, Ol’ Sol rises a minute earlier.

Using software developed by the U.S. Naval Observatory, I’ve prepared a spreadsheet with the times of sunrise, sunset, meridian transit, and civil twilights, for Stillwater Station.