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Rozhen Night Plan

Up to ten targets, one night: each gets its good/marginal/poor windows (darkness × altitude × Moon × clouds, as on the single-target page), then the night is handed out five minutes at a time to whichever target is best — with hysteresis, so you get a few solid blocks of at least 30 minutes, not a flicker. Targets that never win a block are listed with the reason.

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Night of Monday, 21 December 2026 · astronomical night 18:34 → 06:04 (11.51 h) · Moon 93% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:30–18:05: quality 0.1M31 18:05–18:35: quality 0.2M31 18:35–21:05: quality 0.4M31 21:05–01:10: quality 0.3M31 01:10–01:45: quality 0.2observe M31 21:15–22:55M42M42 20:10–21:00: quality 0.2M42 21:00–01:00: quality 0.3M42 01:00–02:55: quality 0.4M42 02:55–03:35: quality 0.3M42 03:35–03:45: quality 0.2observe M42 22:55–00:30observe M42 03:10–03:15M45M45 17:30–17:55: quality 0.1M45 18:05–18:35: quality 0.2M45 18:35–03:30: quality 0.3M45 03:30–03:45: quality 0.2observe M45 00:30–03:10NGC 7000NGC 7000 17:30–18:05: quality 0.1NGC 7000 18:05–18:35: quality 0.3NGC 7000 18:35–19:50: quality 0.6NGC 7000 19:50–21:15: quality 0.5NGC 7000 21:15–21:45: quality 0.4NGC 7000 21:45–22:10: quality 0.3NGC 7000 22:10–22:15: quality 0.2observe NGC 7000 18:05–19:40V1057 CygV1057 Cyg 17:30–18:05: quality 0.1V1057 Cyg 18:05–18:35: quality 0.3V1057 Cyg 18:35–19:50: quality 0.6V1057 Cyg 19:50–21:15: quality 0.5V1057 Cyg 21:15–21:45: quality 0.4V1057 Cyg 21:45–22:10: quality 0.3V1057 Cyg 22:10–22:15: quality 0.2observe V1057 Cyg 19:40–21:15M33M33 17:30–18:05: quality 0.1M33 18:05–18:35: quality 0.2M33 18:35–18:55: quality 0.4M33 18:55–01:10: quality 0.3M33 01:10–01:55: quality 0.2scheduleNGC 7000V1057 CygM31M42M4518:0020:0022:0000:0002:0004:0006:00

Each row is the target's quality through the night, white → amber → green for 0 → 0.3 → 0.6 → 1 (the same thresholds as poor / marginal / good). Dark blue: the schedule. Grey columns: twilight.  Download: schedule CSV · targets CSV · JSON

Schedule

localtargethoursmean quality
16:50–18:05 — nothing worth pointing at — 1.25
18:05–19:40 NGC 7000 1.58 0.51
19:40–21:15 V1057 Cyg 1.58 0.51
21:15–22:55 M31 1.67 0.34
22:55–00:30 M42 1.58 0.32
00:30–03:10 M45 2.67 0.33
03:10–03:15 M42 0.08 0.31
03:15–07:50 — nothing worth pointing at — 4.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 27 unknown 18:35–00:50 (marginal) 89.7° at 19:05 41.1° 1.67
M42 Great Orion Nebula 22 unknown 22:55–03:15 (marginal) 42.9° at 23:55 40.4° 1.67
M45 Seven Sisters 25 unknown 23:55–03:10 (marginal) 72.5° at 22:05 1.0° 2.67
NGC 7000 North America Nebula 32 unknown 18:35–19:00 (good) 87.3° at 15:20 80.6° 1.58
V1057 Cyg 32 unknown 18:35–19:00 (good) 87.3° at 15:20 80.6° 1.58
M33 Triangulum Pinwheel 20 unknown 18:35–20:10 (marginal) 79.1° at 19:55 29.7° 0.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-12-21"

targets: names or RA Dec, separated by commas, semicolons or newlines, at most ten. The response carries targets[] (score, verdict, best_window, windows, transit, moon_separation), schedule[] (blocks with target, start/end in UTC and local, hours, mean_quality; target: null is idle time), unscheduled[] with a why, forecast_source, warnings[]. Missing targets → 400 {"error", "code": "targets_missing"}; an unreadable date → 400 {"error", "code": "invalid_date"}.