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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, 17 January 2027 · astronomical night 18:55 → 06:06 (11.19 h) · Moon 72% (waxing gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:50–18:25: quality 0.1M31 18:25–19:00: quality 0.2M31 19:00–21:00: quality 0.5M31 21:00–23:20: quality 0.4M31 23:20–23:55: quality 0.3M31 23:55–00:00: quality 0.2observe M31 20:20–21:30M42M42 18:25–18:55: quality 0.1M42 18:55–19:00: quality 0.2M42 19:00–19:10: quality 0.3M42 19:10–21:05: quality 0.4M42 21:05–01:15: quality 0.5M42 01:15–01:40: quality 0.4M42 01:40–02:00: quality 0.3observe M42 22:40–23:50observe M42 01:50–01:55M45M45 17:50–18:25: quality 0.1M45 18:25–19:00: quality 0.2M45 19:00–21:10: quality 0.4M45 21:10–01:10: quality 0.5M45 01:10–01:35: quality 0.4M45 01:35–02:00: quality 0.3observe M45 23:50–01:50NGC 7000NGC 7000 17:50–18:25: quality 0.1NGC 7000 18:25–19:00: quality 0.3NGC 7000 19:00–19:10: quality 0.6NGC 7000 19:10–19:45: quality 0.5NGC 7000 19:45–20:10: quality 0.4NGC 7000 20:10–20:30: quality 0.3NGC 7000 06:40–07:15: quality 0.1observe NGC 7000 19:00–20:10V1057 CygV1057 Cyg 17:50–18:25: quality 0.1V1057 Cyg 18:25–19:00: quality 0.3V1057 Cyg 19:00–19:05: quality 0.6V1057 Cyg 19:05–19:45: quality 0.5V1057 Cyg 19:45–20:10: quality 0.4V1057 Cyg 20:10–20:30: quality 0.3V1057 Cyg 06:40–07:15: quality 0.1observe V1057 Cyg 20:10–20:20M33M33 17:50–18:25: quality 0.1M33 18:25–19:00: quality 0.2M33 19:00–23:30: quality 0.4M33 23:30–00:00: quality 0.3M33 00:00–00:10: quality 0.2observe M33 21:30–22:40scheduleNGC 7000M31M33M42M4518:0020:0022:0000:0002:0004:0006:00

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
17:15–19:00 — nothing worth pointing at — 1.75
19:00–20:10 NGC 7000 1.17 0.47
20:10–20:20 V1057 Cyg 0.17 0.32
20:20–21:30 M31 1.17 0.45
21:30–22:40 M33 1.17 0.42
22:40–23:50 M42 1.17 0.5
23:50–01:50 M45 2.0 0.44
01:50–01:55 M42 0.08 0.3
01:55–07:45 — nothing worth pointing at — 5.83

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 28 unknown 19:00–23:35 (marginal) 89.5° at 17:20 37.2° 1.17
M42 Great Orion Nebula 41 unknown 19:00–01:55 (marginal) 42.9° at 22:10 43.9° 1.25
M45 Seven Sisters 40 unknown 19:00–01:50 (marginal) 72.5° at 20:20 5.8° 2.0
NGC 7000 North America Nebula 13 unknown 19:00–20:20 (marginal) 87.3° at 13:35 77.3° 1.17
V1057 Cyg 13 unknown 19:00–20:20 (marginal) 87.3° at 13:35 77.3° 0.17
M33 Triangulum Pinwheel 25 unknown 19:00–23:45 (marginal) 79.1° at 18:10 24.7° 1.17
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-01-17"

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"}.