Reading the length of a day

Daylight changes gradually enough that it can escape attention until the difference feels sudden. Watching one familiar window gives that change a scale. The patch of light moves across a wall, touches a different shelf and disappears at a slightly different hour.

Record what you can actually see rather than estimating an exact astronomical time. Note whether the sky was clear, whether nearby buildings cast shade and where the light reached. Weather and surroundings are part of the observation.

After several weeks, compare the notes on one page. The pattern is often easier to understand as a sequence of small descriptions than as a single photograph.