Your own points on the chart

An observing log and a comet's track, as the sample. Drag the two handles to choose the days shown, press Play to watch them go by, and click or press Enter on a point for its card. Everything stays in this page: nothing is sent anywhere.

Days shown –

Join each group with a line

Import CSV or JSON

CSV columns: id, ra, dec, date, label, color, size, group (ra and dec in degrees; date as 2026-11-08 or 2026-11-08T21:30). JSON is a list of the same fields.