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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 Thursday, 17 December 2026 · astronomical night 18:32 → 06:02 (11.5 h) · Moon 57% (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 0.3M31 18:35–21:05: quality 0.6M31 21:05–23:40: quality 0.7M31 23:40–01:00: quality 0.6M31 01:00–01:05: quality 0.8M31 01:05–01:20: quality 0.7M31 01:20–01:35: quality 0.6M31 01:35–01:55: quality 0.5M31 01:55–02:00: quality 0.4M42M42 20:25–20:35: quality 0.3M42 20:35–20:50: quality 0.4M42 20:50–21:10: quality 0.5M42 21:10–21:40: quality 0.6M42 21:40–23:45: quality 0.7M42 23:45–01:00: quality 0.8M42 01:00–01:55: quality 0.9M42 01:55–03:05: quality 0.8M42 03:05–03:20: quality 0.7M42 03:20–03:40: quality 0.6M42 03:40–03:55: quality 0.5M42 03:55–04:00: quality 0.4observe M42 23:15–01:00M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.3M45 18:35–19:40: quality 0.6M45 19:40–22:40: quality 0.7M45 22:40–01:00: quality 0.8M45 01:00–01:05: quality 1.0M45 01:05–02:25: quality 0.9M45 02:25–03:15: quality 0.8M45 03:15–03:25: quality 0.7M45 03:25–03:40: quality 0.6M45 03:40–03:55: quality 0.5M45 03:55–04:00: quality 0.4observe M45 21:30–23:15observe M45 02:10–04:00NGC 7000NGC 7000 17:25–18:00: quality 0.1NGC 7000 18:00–18:35: quality 0.3NGC 7000 18:35–19:20: quality 0.7NGC 7000 19:20–21:30: quality 0.6NGC 7000 21:30–21:55: quality 0.5NGC 7000 21:55–22:20: quality 0.4NGC 7000 22:20–22:30: quality 0.3observe NGC 7000 18:00–19:45V1057 CygV1057 Cyg 17:25–18:00: quality 0.1V1057 Cyg 18:00–18:35: quality 0.3V1057 Cyg 18:35–19:20: quality 0.7V1057 Cyg 19:20–21:30: quality 0.6V1057 Cyg 21:30–21:55: quality 0.5V1057 Cyg 21:55–22:20: quality 0.4V1057 Cyg 22:20–22:30: quality 0.3observe V1057 Cyg 19:45–21:30M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.3M33 18:35–21:40: quality 0.6M33 21:40–00:15: quality 0.7M33 00:15–01:00: quality 0.6M33 01:00–01:20: quality 0.8M33 01:20–01:35: quality 0.7M33 01:35–01:50: quality 0.6M33 01:50–02:05: quality 0.5M33 02:05–02:10: quality 0.4observe M33 01:00–02:10scheduleNGC 7000V1057 CygM45M42M33M4518:0020:0022:0000:0002:0004:0006:00

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
18:00–19:45 NGC 7000 1.75 0.55
19:45–21:30 V1057 Cyg 1.75 0.6
21:30–23:15 M45 1.75 0.74
23:15–01:00 M42 1.75 0.76
01:00–02:10 M33 1.17 0.65
02:10–04:00 M45 1.83 0.72
04:00–07:45 — nothing worth pointing at — 3.75

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 76 unknown 18:35–01:30 (good) 89.7° at 19:20 37.2° 0.0
M42 Great Orion Nebula 88 unknown 21:20–03:30 (good) 42.9° at 00:10 81.9° 1.75
M45 Seven Sisters 95 unknown 18:45–03:35 (good) 72.5° at 22:25 55.5° 3.58
NGC 7000 North America Nebula 43 unknown 18:35–20:40 (good) 87.3° at 15:35 57.5° 1.75
V1057 Cyg 43 unknown 18:35–20:40 (good) 87.3° at 15:35 57.4° 1.75
M33 Triangulum Pinwheel 82 unknown 18:35–01:45 (good) 79.1° at 20:10 32.6° 1.17

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-12-17"

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"}.