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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 Sunday, 20 December 2026 · astronomical night 18:33 → 06:04 (11.51 h) · Moon 86% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:25–18:00: quality 0.1M31 18:00–18:35: quality 0.2M31 18:35–22:35: quality 0.4M31 22:35–23:40: quality 0.3M31 23:40–00:50: quality 0.4M31 00:50–01:30: quality 0.3M31 01:30–01:50: quality 0.2observe M31 21:20–23:00M42M42 20:15–20:40: quality 0.2M42 20:40–21:15: quality 0.3M42 21:15–00:05: quality 0.4M42 00:05–03:00: quality 0.5M42 03:00–03:30: quality 0.4M42 03:30–03:50: quality 0.3observe M42 23:00–00:40observe M42 03:35–03:45M45M45 17:30–18:00: quality 0.1M45 18:00–18:35: quality 0.2M45 18:35–22:25: quality 0.3M45 22:25–03:20: quality 0.4M45 03:20–03:50: quality 0.3observe M45 01:25–03:35NGC 7000NGC 7000 17:25–18:00: quality 0.1NGC 7000 18:00–18:35: quality 0.3NGC 7000 18:35–19:25: quality 0.6NGC 7000 19:25–21:15: quality 0.5NGC 7000 21:15–21:45: quality 0.4NGC 7000 21:45–22:15: quality 0.3NGC 7000 22:15–22:20: quality 0.2observe NGC 7000 18:00–19:40V1057 CygV1057 Cyg 17:25–18:00: quality 0.1V1057 Cyg 18:00–18:35: quality 0.3V1057 Cyg 18:35–19:25: quality 0.6V1057 Cyg 19:25–21:15: quality 0.5V1057 Cyg 21:15–21:45: quality 0.4V1057 Cyg 21:45–22:15: quality 0.3V1057 Cyg 22:15–22:20: quality 0.2observe V1057 Cyg 19:40–21:20M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.2M33 18:35–19:45: quality 0.4M33 19:45–23:50: quality 0.3M33 23:50–01:05: quality 0.4M33 01:05–01:45: quality 0.3M33 01:45–02:00: quality 0.2observe M33 00:40–01:25scheduleNGC 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
16:50–18:00 — nothing worth pointing at — 1.17
18:00–19:40 NGC 7000 1.67 0.48
19:40–21:20 V1057 Cyg 1.67 0.5
21:20–23:00 M31 1.67 0.35
23:00–00:40 M42 1.67 0.44
00:40–01:25 M33 0.75 0.35
01:25–03:35 M45 2.17 0.42
03:35–03:45 M42 0.17 0.31
03:45–07:45 — nothing worth pointing at — 4.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 26 unknown 18:35–01:10 (marginal) 89.5° at 19:10 32.6° 1.67
M42 Great Orion Nebula 39 unknown 20:55–03:45 (marginal) 42.9° at 00:00 49.6° 1.83
M45 Seven Sisters 40 unknown 18:35–03:35 (marginal) 72.5° at 22:10 14.5° 2.17
NGC 7000 North America Nebula 30 unknown 18:00–22:00 (marginal) 87.3° at 15:25 72.9° 1.67
V1057 Cyg 30 unknown 18:00–22:00 (marginal) 87.3° at 15:25 72.9° 1.67
M33 Triangulum Pinwheel 26 unknown 18:35–01:25 (marginal) 79.1° at 20:00 18.5° 0.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-12-20"

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"}.