[TRACKING]
Presets: last sub ends

Drag to orbit, scroll to zoom. German equatorial mount at a mid-northern latitude; target transits the zenith. The scenario recomputes live from the settings above. The angular scale is exaggerated for clarity.

How NINA decides the last sub

NINA never cuts a sub short to make the flip. The decision happens between exposures: before each new sub, NINA checks whether it can finish before the flip deadline. A sub that fits runs to completion, and a sub that does not fit is simply never started, so the flip begins right after the previous sub ends.

Flip window opens Deadline What people expect (wrong) NINA never truncates or aborts a sub at the deadline. This does not happen. Fits NINA checks between exposures: the next sub fits, so it runs; the flip starts right after. Does not fit - skipped The next sub would finish after the deadline: it is never started. A running sub is never aborted. 0 (meridian) +2m +15m Example: 420 s subs, Minutes after meridian +2m, deadline +15m