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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, 13 December 2026 · astronomical night 18:31 → 05:59 (11.48 h) · Moon 20% (waxing crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:25–18:00: quality 0.1M31 18:00–18:35: quality 0.5M31 18:35–20:20: quality 0.9M31 20:20–23:00: quality 1.0M31 23:00–00:25: quality 0.9M31 00:25–01:20: quality 0.8M31 01:20–01:35: quality 0.7M31 01:35–01:50: quality 0.6M31 01:50–02:10: quality 0.5M31 02:10–02:15: quality 0.4observe M31 19:45–21:30M42M42 20:40–20:50: quality 0.4M42 20:50–21:05: quality 0.5M42 21:05–21:20: quality 0.6M42 21:20–21:40: quality 0.7M42 21:40–22:50: quality 0.8M42 22:50–02:10: quality 0.9M42 02:10–03:20: quality 0.8M42 03:20–03:40: quality 0.7M42 03:40–03:55: quality 0.6M42 03:55–04:10: quality 0.5M42 04:10–04:15: quality 0.4observe M42 02:00–04:15M45M45 17:25–18:00: quality 0.1M45 18:00–18:35: quality 0.4M45 18:35–19:05: quality 0.8M45 19:05–20:25: quality 0.9M45 20:25–01:20: quality 1.0M45 01:20–02:40: quality 0.9M45 02:40–03:30: quality 0.8M45 03:30–03:45: quality 0.7M45 03:45–03:55: quality 0.6M45 03:55–04:10: quality 0.5M45 04:10–04:15: quality 0.4observe M45 00:15–02:00NGC 7000NGC 7000 17:25–18:00: quality 0.1NGC 7000 18:00–18:35: quality 0.5NGC 7000 18:35–20:00: quality 0.9NGC 7000 20:00–20:45: quality 0.8NGC 7000 20:45–20:50: quality 0.9NGC 7000 20:50–21:45: quality 0.8NGC 7000 21:45–22:05: quality 0.7NGC 7000 22:05–22:20: quality 0.6NGC 7000 22:20–22:40: quality 0.5NGC 7000 22:40–22:45: quality 0.4observe NGC 7000 18:00–19:45V1057 CygV1057 Cyg 17:25–18:00: quality 0.1V1057 Cyg 18:00–18:35: quality 0.5V1057 Cyg 18:35–20:00: quality 0.9V1057 Cyg 20:00–20:45: quality 0.8V1057 Cyg 20:45–20:50: quality 0.9V1057 Cyg 20:50–21:45: quality 0.8V1057 Cyg 21:45–22:05: quality 0.7V1057 Cyg 22:05–22:20: quality 0.6V1057 Cyg 22:20–22:40: quality 0.5V1057 Cyg 22:40–22:45: quality 0.4observe V1057 Cyg 21:30–22:30M33M33 17:25–18:00: quality 0.1M33 18:00–18:35: quality 0.5M33 18:35–20:00: quality 0.9M33 20:00–23:30: quality 1.0M33 23:30–00:50: quality 0.9M33 00:50–01:40: quality 0.8M33 01:40–01:50: quality 0.7M33 01:50–02:05: quality 0.6M33 02:05–02:20: quality 0.5M33 02:20–02:30: quality 0.4observe M33 22:30–00:15scheduleNGC 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 0.75
19:45–21:30 M31 1.75 0.97
21:30–22:30 V1057 Cyg 1.0 0.67
22:30–00:15 M33 1.75 0.96
00:15–02:00 M45 1.75 0.96
02:00–04:15 M42 2.25 0.73
04:15–07:45 — nothing worth pointing at — 3.5

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:35–01:45 (good) 89.7° at 19:35 76.2° 1.75
M42 Great Orion Nebula 89 unknown 21:15–03:45 (good) 42.9° at 00:25 122.4° 2.25
M45 Seven Sisters 100 unknown 18:35–03:50 (good) 72.5° at 22:40 104.9° 1.75
NGC 7000 North America Nebula 84 unknown 18:35–22:10 (good) 87.2° at 15:50 61.4° 1.75
V1057 Cyg 84 unknown 18:35–22:10 (good) 87.3° at 15:50 61.3° 1.0
M33 Triangulum Pinwheel 100 unknown 18:35–02:00 (good) 79.1° at 20:25 79.3° 1.75
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-12-13"

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"}.