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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, 19 December 2027 · astronomical night 18:33 → 06:03 (11.51 h) · Moon 55% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:25–18:00: quality 0.2M31 18:00–18:35: quality 0.5M31 18:35–22:40: quality 1.0M31 22:40–00:00: quality 0.9M31 00:00–00:50: quality 0.8M31 00:50–01:10: quality 0.7M31 01:10–01:25: quality 0.6M31 01:25–01:40: quality 0.5M31 01:40–01:55: quality 0.4observe M31 19:40–21:20M42M42 20:20–20:25: quality 0.4M42 20:25–20:45: quality 0.5M42 20:45–21:00: quality 0.6M42 21:00–21:15: quality 0.7M42 21:15–22:25: quality 0.8M42 22:25–00:00: quality 0.9M42 00:00–01:20: quality 0.8M42 01:20–02:55: quality 0.7M42 02:55–03:15: quality 0.6M42 03:15–03:35: quality 0.5M42 03:35–03:50: quality 0.4M42 03:50–03:55: quality 0.3observe M42 01:30–03:55M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–19:40: quality 0.9M45 19:40–00:00: quality 1.0M45 00:00–01:25: quality 0.9M45 01:25–02:45: quality 0.8M45 02:45–03:10: quality 0.7M45 03:10–03:25: quality 0.6M45 03:25–03:40: quality 0.5M45 03:40–03:55: quality 0.4observe M45 23:50–01:30NGC 7000NGC 7000 17:25–18:00: quality 0.2NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–19:00: quality 1.0NGC 7000 19:00–20:30: quality 0.9NGC 7000 20:30–21:25: quality 0.8NGC 7000 21:25–21:40: quality 0.7NGC 7000 21:40–22:00: quality 0.6NGC 7000 22:00–22:15: quality 0.5NGC 7000 22:15–22:25: quality 0.4observe NGC 7000 18:00–19:40V1057 CygV1057 Cyg 17:25–18:00: quality 0.2V1057 Cyg 18:00–18:35: quality 0.5V1057 Cyg 18:35–19:00: quality 1.0V1057 Cyg 19:00–20:30: quality 0.9V1057 Cyg 20:30–21:25: quality 0.8V1057 Cyg 21:25–21:40: quality 0.7V1057 Cyg 21:40–22:00: quality 0.6V1057 Cyg 22:00–22:15: quality 0.5V1057 Cyg 22:15–22:25: quality 0.4observe V1057 Cyg 21:20–22:10M33M33 17:25–17:45: quality 0.1M33 17:45–18:00: quality 0.2M33 18:00–18:35: quality 0.5M33 18:35–23:05: quality 1.0M33 23:05–00:00: quality 0.9M33 00:00–01:10: quality 0.8M33 01:10–01:25: quality 0.7M33 01:25–01:40: quality 0.6M33 01:40–01:55: quality 0.5M33 01:55–02:05: quality 0.4observe M33 22:10–23:50scheduleNGC 7000M31V1057 CygM33M45M4218:0020:0022:0000:0002:0004:0006:00

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 0.79
19:40–21:20 M31 1.67 1.0
21:20–22:10 V1057 Cyg 0.83 0.62
22:10–23:50 M33 1.67 0.96
23:50–01:30 M45 1.67 0.91
01:30–03:55 M42 2.42 0.62
03:55–07:45 — nothing worth pointing at — 3.83

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:35–01:15 (good) 89.5° at 19:15 135.4° 1.67
M42 Great Orion Nebula 89 unknown 20:50–03:05 (good) 42.9° at 00:05 87.2° 2.42
M45 Seven Sisters 100 unknown 18:35–03:20 (good) 72.5° at 22:15 112.3° 1.67
NGC 7000 North America Nebula 84 unknown 18:35–21:50 (good) 87.2° at 15:30 125.5° 1.67
V1057 Cyg 84 unknown 18:35–21:50 (good) 87.3° at 15:30 125.6° 0.83
M33 Triangulum Pinwheel 100 unknown 18:35–01:30 (good) 79.1° at 20:05 136.8° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-12-19"

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"}.