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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 Tuesday, 20 January 2026 · astronomical night 18:58 → 06:05 (11.11 h) · Moon 5% (waxing crescent) · weather: ERA5 history

M31M31 17:55–18:30: quality 0.1M31 18:30–19:00: quality 0.5M31 19:00–20:30: quality 1.0M31 20:30–21:00: quality 0.9M31 21:00–21:55: quality 0.8M31 21:55–22:00: quality 0.7M31 22:00–22:50: quality 0.6M31 22:50–23:00: quality 0.5observe M31 20:45–21:35M42M42 18:10–18:30: quality 0.1M42 18:30–19:00: quality 0.3M42 19:00–19:10: quality 0.7M42 19:10–20:20: quality 0.8M42 20:20–21:00: quality 0.9M42 21:00–22:00: quality 0.8M42 22:00–23:00: quality 0.6M42 00:00–01:00: quality 0.1M42 01:00–01:35: quality 0.2M42 01:35–01:45: quality 0.1observe M42 21:35–23:00M45M45 17:55–18:30: quality 0.1M45 18:30–19:00: quality 0.5M45 19:00–21:00: quality 1.0M45 21:00–22:00: quality 0.9M45 22:00–23:00: quality 0.7M45 00:00–01:00: quality 0.1M45 01:00–01:40: quality 0.2M45 01:40–01:45: quality 0.1observe M45 18:30–19:20NGC 7000NGC 7000 17:55–18:30: quality 0.1NGC 7000 18:30–19:00: quality 0.4NGC 7000 19:00–19:15: quality 0.8NGC 7000 19:15–19:35: quality 0.7NGC 7000 19:35–19:50: quality 0.6NGC 7000 19:50–20:05: quality 0.5NGC 7000 20:05–20:15: quality 0.4observe NGC 7000 19:20–19:55V1057 CygV1057 Cyg 17:55–18:30: quality 0.1V1057 Cyg 18:30–19:00: quality 0.4V1057 Cyg 19:00–19:15: quality 0.8V1057 Cyg 19:15–19:35: quality 0.7V1057 Cyg 19:35–19:50: quality 0.6V1057 Cyg 19:50–20:05: quality 0.5V1057 Cyg 20:05–20:15: quality 0.4M33M33 17:55–18:30: quality 0.1M33 18:30–19:00: quality 0.5M33 19:00–21:00: quality 1.0M33 21:00–22:00: quality 0.8M33 22:00–23:00: quality 0.6observe M33 19:55–20:45scheduleM45M33M31M4218:0020:0022:0000:0002:0004:0006:00

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
17:20–18:30 — nothing worth pointing at — 1.17
18:30–19:20 M45 0.83 0.7
19:20–19:55 NGC 7000 0.58 0.62
19:55–20:45 M33 0.83 0.99
20:45–21:35 M31 0.83 0.83
21:35–23:00 M42 1.42 0.69
23:00–07:45 — nothing worth pointing at — 8.75

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 83 19:00–22:25 (good) 89.7° at 17:05 67.9° 0.83
M42 Great Orion Nebula 89 55 19:00–23:00 (good) 42.9° at 21:55 113.2° 1.42
M45 Seven Sisters 100 64 19:00–23:00 (good) 72.5° at 20:10 94.3° 0.83
NGC 7000 North America Nebula 23 21 19:00–19:40 (good) 87.2° at 13:20 59.8° 0.58
V1057 Cyg 23 21 19:00–19:40 (good) 87.3° at 13:20 59.7° 0.0
M33 Triangulum Pinwheel 100 81 19:00–22:45 (good) 79.1° at 17:55 69.5° 0.83

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-01-20"

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"}.