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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 Tuesday, 21 December 2027 · astronomical night 18:33 → 06:04 (11.51 h) · Moon 33% (waning crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:30–18:05: quality 0.2M31 18:05–18:35: quality 0.5M31 18:35–22:30: quality 1.0M31 22:30–23:55: quality 0.9M31 23:55–00:50: quality 0.8M31 00:50–01:05: quality 0.7M31 01:05–01:20: quality 0.6M31 01:20–01:40: quality 0.5M31 01:40–01:45: quality 0.4observe M31 19:45–21:25M42M42 20:10–20:20: quality 0.4M42 20:20–20:35: quality 0.5M42 20:35–20:50: quality 0.6M42 20:50–21:05: quality 0.7M42 21:05–22:20: quality 0.8M42 22:20–01:40: quality 0.9M42 01:40–02:45: quality 0.8M42 02:45–03:05: quality 0.7M42 03:05–03:20: quality 0.6M42 03:20–03:35: quality 0.5M42 03:35–03:45: quality 0.4observe M42 01:20–03:45M45M45 17:30–18:05: quality 0.1M45 18:05–18:35: quality 0.4M45 18:35–19:30: quality 0.9M45 19:30–00:50: quality 1.0M45 00:50–02:10: quality 0.9M45 02:10–02:55: quality 0.8M45 02:55–03:10: quality 0.7M45 03:10–03:25: quality 0.6M45 03:25–03:40: quality 0.5M45 03:40–03:45: quality 0.4observe M45 23:40–01:20NGC 7000NGC 7000 17:30–18:05: quality 0.2NGC 7000 18:05–18:35: quality 0.5NGC 7000 18:35–18:50: quality 1.0NGC 7000 18:50–20:20: quality 0.9NGC 7000 20:20–21:15: quality 0.8NGC 7000 21:15–21:35: quality 0.7NGC 7000 21:35–21:50: quality 0.6NGC 7000 21:50–22:05: quality 0.5NGC 7000 22:05–22:15: quality 0.4observe NGC 7000 18:05–19:45V1057 CygV1057 Cyg 17:30–18:05: quality 0.2V1057 Cyg 18:05–18:35: quality 0.5V1057 Cyg 18:35–18:50: quality 1.0V1057 Cyg 18:50–20:20: quality 0.9V1057 Cyg 20:20–21:15: quality 0.8V1057 Cyg 21:15–21:35: quality 0.7V1057 Cyg 21:35–21:50: quality 0.6V1057 Cyg 21:50–22:05: quality 0.5V1057 Cyg 22:05–22:15: quality 0.4observe V1057 Cyg 21:25–22:00M33M33 17:30–17:40: quality 0.1M33 17:40–18:05: quality 0.2M33 18:05–18:35: quality 0.5M33 18:35–23:00: quality 1.0M33 23:00–00:20: quality 0.9M33 00:20–01:05: quality 0.8M33 01:05–01:20: quality 0.7M33 01:20–01:35: quality 0.6M33 01:35–01:50: quality 0.5M33 01:50–01:55: quality 0.4observe M33 22:00–23:40scheduleNGC 7000M31M33M45M4218:0020:0022:0000:0002:0004:0006:00

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
18:05–19:45 NGC 7000 1.67 0.8
19:45–21:25 M31 1.67 1.0
21:25–22:00 V1057 Cyg 0.58 0.59
22:00–23:40 M33 1.67 0.96
23:40–01:20 M45 1.67 0.97
01:20–03:45 M42 2.42 0.72
03:45–07:45 — nothing worth pointing at — 4.0

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:35–01:15 (good) 89.7° at 19:05 150.7° 1.67
M42 Great Orion Nebula 89 unknown 20:45–03:10 (good) 42.9° at 23:55 110.3° 2.42
M45 Seven Sisters 100 unknown 18:35–03:15 (good) 72.5° at 22:10 139.9° 1.67
NGC 7000 North America Nebula 79 unknown 18:35–21:40 (good) 87.2° at 15:20 119.0° 1.67
V1057 Cyg 79 unknown 18:35–21:40 (good) 87.3° at 15:20 119.0° 0.58
M33 Triangulum Pinwheel 100 unknown 18:35–01:30 (good) 79.1° at 19:55 160.4° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-12-21"

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"}.