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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, 23 January 2026 · astronomical night 19:01 → 06:03 (11.03 h) · Moon 26% (waxing crescent) · weather: ERA5 history

M31M31 18:00–18:30: quality 0.1M31 18:30–19:05: quality 0.4M31 19:05–19:15: quality 0.8M31 19:15–19:45: quality 0.9M31 19:45–21:00: quality 0.8M31 23:00–23:05: quality 0.3M31 23:05–23:35: quality 0.2observe M31 18:30–19:10M42M42 18:00–18:30: quality 0.1M42 18:30–19:00: quality 0.3M42 19:00–19:05: quality 0.4M42 19:05–19:30: quality 0.7M42 19:30–21:00: quality 0.8M42 23:00–00:00: quality 0.4M42 00:00–01:00: quality 0.1observe M42 23:05–00:00M45M45 18:00–18:30: quality 0.1M45 18:30–19:05: quality 0.4M45 19:05–21:00: quality 0.9M45 23:00–00:00: quality 0.4M45 00:00–01:00: quality 0.1observe M45 19:50–20:30NGC 7000NGC 7000 18:00–18:30: quality 0.1NGC 7000 18:30–18:55: quality 0.4NGC 7000 18:55–19:05: quality 0.3NGC 7000 19:05–19:25: quality 0.6NGC 7000 19:25–19:45: quality 0.5NGC 7000 19:45–20:05: quality 0.4observe NGC 7000 19:10–19:50V1057 CygV1057 Cyg 18:00–18:30: quality 0.1V1057 Cyg 18:30–18:55: quality 0.4V1057 Cyg 18:55–19:05: quality 0.3V1057 Cyg 19:05–19:25: quality 0.6V1057 Cyg 19:25–19:45: quality 0.5V1057 Cyg 19:45–20:05: quality 0.4M33M33 18:00–18:30: quality 0.1M33 18:30–19:05: quality 0.4M33 19:05–19:45: quality 0.8M33 19:45–20:00: quality 0.9M33 20:00–21:00: quality 0.8M33 23:00–23:20: quality 0.3M33 23:20–23:45: quality 0.2observe M33 20:30–21:00observe M33 23:00–23:05scheduleM4218:0020:0022:0000:0002:0004:0006:00

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
17:25–18:30 — nothing worth pointing at — 1.08
18:30–19:10 M31 0.67 0.48
19:10–19:50 NGC 7000 0.67 0.53
19:50–20:30 M45 0.67 0.86
20:30–21:00 M33 0.5 0.8
21:00–23:00 — nothing worth pointing at — 2.0
23:00–23:05 M33 0.08 0.3
23:05–00:00 M42 0.92 0.37
00:00–07:45 — nothing worth pointing at — 7.75

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 79 43 19:05–21:00 (good) 89.6° at 16:55 37.7° 0.67
M42 Great Orion Nebula 88 36 19:05–21:00 (good) 42.9° at 21:45 80.5° 0.92
M45 Seven Sisters 96 41 19:05–21:00 (good) 72.5° at 19:55 54.6° 0.67
NGC 7000 North America Nebula 15 13 19:05–19:15 (good) 87.3° at 13:10 58.9° 0.67
V1057 Cyg 15 13 19:05–19:15 (good) 87.3° at 13:10 58.8° 0.0
M33 Triangulum Pinwheel 83 44 19:05–21:00 (good) 79.1° at 17:45 32.4° 0.58

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-01-23"

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"}.