Two years of daylight, an hour at a time

  • Each column is one day, —. Each cell is one UTC hour, shaded by what the array made in it.
  • Nothing here draws the shape of the year. The seasons widen and narrow the bright band on their own, and overcast days show as faint streaks.
  • The amber curves are sunrise, solar noon and sunset. Python calculates them from the site's latitude, longitude and the date; I never fitted them to the data.
  • The curves trace the exact edge of the measured band. So the geometry and the meter agree, and each checks the other.
  • The hours are UTC, so the band does not step when the clocks change; dashed lines mark the changes. Each column still holds one New York day's light.
  • Of — days, — hours have a full record. The best of them made — kWh.
  • All hours together made — MWh. Python integrates each hour from the power gauge, whose last reading holds through a quiet spell.
  • An hour with any part not recorded is left out. The roof model's windows use the same rule.
  • The Every Day page gives — MWh from the meter's cumulative counters, and the front page quotes that figure.

nonepeak not recorded computed sun position clock change