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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, 16 December 2027 · astronomical night 18:31 → 06:01 (11.5 h) · Moon 86% (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 18:35–20:15: quality 1.0M31 20:15–21:05: quality 0.9M31 21:05–23:05: quality 0.8M31 23:05–00:30: quality 0.7M31 00:30–01:15: quality 0.6M31 01:15–01:35: quality 0.5M31 01:35–01:55: quality 0.4M31 01:55–02:05: quality 0.3observe M31 19:40–21:20M42M42 20:30–20:45: quality 0.3M42 20:45–21:15: quality 0.4M42 21:15–01:05: quality 0.5M42 01:05–03:15: quality 0.4M42 03:15–03:45: quality 0.3M42 03:45–04:05: quality 0.2observe M42 01:50–03:30M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–19:50: quality 0.9M45 19:50–20:15: quality 1.0M45 20:15–20:55: quality 0.8M45 20:55–23:30: quality 0.7M45 23:30–01:30: quality 0.6M45 01:30–03:15: quality 0.5M45 03:15–03:40: quality 0.4M45 03:40–04:00: quality 0.3M45 04:00–04:05: quality 0.2observe M45 00:10–01:50observe M45 03:30–03:50NGC 7000NGC 7000 17:25–18:00: quality 0.2NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–19:10: quality 1.0NGC 7000 19:10–20:15: quality 0.9NGC 7000 20:15–21:10: quality 0.8NGC 7000 21:10–21:40: quality 0.7NGC 7000 21:40–22:00: quality 0.6NGC 7000 22:00–22:20: quality 0.5NGC 7000 22:20–22:35: 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 18:35–19:10: quality 1.0V1057 Cyg 19:10–20:15: quality 0.9V1057 Cyg 20:15–21:10: quality 0.8V1057 Cyg 21:10–21:40: quality 0.7V1057 Cyg 21:40–22:00: quality 0.6V1057 Cyg 22:00–22:20: quality 0.5V1057 Cyg 22:20–22:35: quality 0.4observe V1057 Cyg 21:20–22:30M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.5M33 18:35–20:15: quality 1.0M33 20:15–20:30: quality 0.9M33 20:30–23:10: quality 0.8M33 23:10–00:30: quality 0.7M33 00:30–01:30: quality 0.6M33 01:30–01:45: quality 0.5M33 01:45–02:05: quality 0.4M33 02:05–02:15: quality 0.3observe M33 22:30–00:10scheduleNGC 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 0.8
19:40–21:20 M31 1.67 0.91
21:20–22:30 V1057 Cyg 1.17 0.57
22:30–00:10 M33 1.67 0.74
00:10–01:50 M45 1.67 0.58
01:50–03:30 M42 1.67 0.38
03:30–03:50 M45 0.33 0.34
03:50–07:45 — nothing worth pointing at — 3.92

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:35–01:05 (good) 89.7° at 19:25 99.5° 1.67
M42 Great Orion Nebula 43 unknown 20:35–03:30 (marginal) 42.9° at 00:15 52.0° 1.67
M45 Seven Sisters 98 unknown 18:35–00:45 (good) 72.5° at 22:30 69.2° 2.0
NGC 7000 North America Nebula 86 unknown 18:35–21:50 (good) 87.2° at 15:40 118.0° 1.67
V1057 Cyg 86 unknown 18:35–21:50 (good) 87.3° at 15:40 118.1° 1.17
M33 Triangulum Pinwheel 100 unknown 18:35–01:15 (good) 79.1° at 20:15 95.5° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-12-16"

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"}.