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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 Friday, 17 December 2027 · astronomical night 18:32 → 06:02 (11.5 h) · Moon 77% (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 18:35–21:30: quality 1.0M31 21:30–22:50: quality 0.9M31 22:50–00:10: quality 0.8M31 00:10–01:05: quality 0.7M31 01:05–01:25: quality 0.6M31 01:25–01:40: quality 0.5M31 01:40–02:00: quality 0.4M31 02:00–02:05: quality 0.3observe M31 19:45–21:30M42M42 20:25–20:35: quality 0.4M42 20:35–20:50: quality 0.5M42 20:50–21:05: quality 0.6M42 21:05–21:25: quality 0.7M42 21:25–21:30: quality 0.8M42 21:30–01:35: quality 0.6M42 01:35–03:10: quality 0.5M42 03:10–03:35: quality 0.4M42 03:35–04:00: quality 0.3M42 04:00–04:05: quality 0.2observe M42 01:50–03:50M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–19:45: quality 0.9M45 19:45–21:30: quality 1.0M45 21:30–00:30: quality 0.8M45 00:30–01:50: quality 0.7M45 01:50–03:10: quality 0.6M45 03:10–03:30: quality 0.5M45 03:30–03:50: quality 0.4M45 03:50–04:00: quality 0.3observe M45 00:05–01:50observe M45 03:50–04:00NGC 7000NGC 7000 17:25–18:00: quality 0.2NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–19:05: quality 1.0NGC 7000 19:05–20:35: quality 0.9NGC 7000 20:35–21:30: quality 0.8NGC 7000 21:30–21:40: quality 0.7NGC 7000 21:40–22:00: quality 0.6NGC 7000 22:00–22:15: quality 0.5NGC 7000 22:15–22:30: quality 0.4observe NGC 7000 18:00–19:45V1057 CygV1057 Cyg 17:25–18:00: quality 0.2V1057 Cyg 18:00–18:35: quality 0.5V1057 Cyg 18:35–19:05: quality 1.0V1057 Cyg 19:05–20:35: quality 0.9V1057 Cyg 20:35–21:30: quality 0.8V1057 Cyg 21:30–21:40: quality 0.7V1057 Cyg 21:40–22:00: quality 0.6V1057 Cyg 22:00–22:15: quality 0.5V1057 Cyg 22:15–22:30: quality 0.4observe V1057 Cyg 21:30–22:20M33M33 17:25–17:55: quality 0.1M33 17:55–18:00: quality 0.2M33 18:00–18:35: quality 0.5M33 18:35–21:30: quality 1.0M33 21:30–23:05: quality 0.9M33 23:05–00:20: quality 0.8M33 00:20–01:20: quality 0.7M33 01:20–01:35: quality 0.6M33 01:35–01:55: quality 0.5M33 01:55–02:10: quality 0.4M33 02:10–02:15: quality 0.3observe M33 22:20–00:05scheduleNGC 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
18:00–19:45 NGC 7000 1.75 0.8
19:45–21:30 M31 1.75 1.0
21:30–22:20 V1057 Cyg 0.83 0.57
22:20–00:05 M33 1.75 0.84
00:05–01:50 M45 1.75 0.72
01:50–03:50 M42 2.0 0.46
03:50–04:00 M45 0.17 0.32
04:00–07:45 — nothing worth pointing at — 3.75

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:35–01:15 (good) 89.7° at 19:20 112.2° 1.75
M42 Great Orion Nebula 77 unknown 21:00–00:20 (good) 42.9° at 00:10 63.4° 2.0
M45 Seven Sisters 100 unknown 18:35–02:35 (good) 72.5° at 22:25 83.8° 1.92
NGC 7000 North America Nebula 86 unknown 18:35–21:50 (good) 87.2° at 15:35 122.9° 1.75
V1057 Cyg 86 unknown 18:35–21:50 (good) 87.3° at 15:35 122.9° 0.83
M33 Triangulum Pinwheel 100 unknown 18:35–01:30 (good) 79.1° at 20:10 109.6° 1.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-12-17"

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"}.