Equinox

So: a first blipping toe in the water. The equinox seems like an auspicious day to begin ['auspicious': from a Latin phrase describing those who watched the flight of birds to determine the future and the will of the gods]

A precise(ish) sunset shot for the day when light and dark are balanced. Taken close to the Rollright Stones - a circle that has seen some 4500 such autumn equinox days. The ridge on which they stand divides two parishes, two counties (Warks/Oxon), two Anglo-Saxon kingdoms (Mercia/Wessex), and two watersheds (Severn/Thames)

The Oxford comma is premeditated