Which preset; see PresetName.
The day's solar event instants (Atmosphere's SolarTimes).
Longitude in degrees the solar time is referenced to.
The local solar minute-of-day in [0, 1440), or null if that event does not
occur on the given day (e.g. no sunrise in polar summer) — used to disable the button.
Resolve a preset button to the local solar minute-of-day it should jump to.