indi-allsky has the ability to produce a long term keogram, sometimes referred to a "year long keogram".

The algorithm is agnostic to the length of the exposures and missing data is gracefully handled.

The long term keogram data is included with the SyncAPI so it is available on the remote instance.

Parameter	Usage
Start	This is the starting point of the generated keogram
Timeframe	The time period for the generated keogram
Pixels Per Day	indi-allsky pulls 5 pixels per image for the keogram. This is the number of pixels to use for each row. More pixels means the day (row) will be taller
Alignment	This is the window used to align the timestamps of every sample. The alignment window should be at least slightly larger than the period of your exposures. For example, if you use a 30s exposure period, your alignment window should be 40s or greater. Using a smaller alignment will result in gaps in your data. Multiple samples that fall within the same alignment window will be averaged together. A 60s alignment will result in 1440 generated samples per day with the image being 1440 pixels wide. A 20s alignment will result in 4320 generated samples
Hour Offset	This can be used to shift the graph left or right. The timestamps are UTC, but the date calculations are in the local timezone of the system. If you use the SyncAPI, there can be an offset between these two.