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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, 21 July 2026 · astronomical night 22:49 → 04:05 (5.27 h) · Moon 55% (waxing gibbous) · weather: ERA5 history

M31M31 23:30–23:45: quality 0.4M31 23:45–00:05: quality 0.5M31 00:05–00:15: quality 0.6M31 00:15–00:35: quality 0.7M31 00:35–01:45: quality 0.8M31 01:45–02:00: quality 0.9M31 02:00–02:10: quality 0.8M31 02:10–03:00: quality 0.9M31 04:00–04:10: quality 0.8M31 04:10–04:55: quality 0.4M31 04:55–05:00: quality 0.1M31 05:00–05:35: quality 0.2observe M31 01:00–02:05M42M45M45 04:00–04:10: quality 0.5M45 04:10–04:55: quality 0.3M45 04:55–05:35: quality 0.1observe M45 04:30–04:55NGC 7000NGC 7000 22:05–22:50: quality 0.2NGC 7000 22:50–23:00: quality 0.3NGC 7000 23:00–23:05: quality 0.8NGC 7000 23:05–01:00: quality 0.9NGC 7000 01:00–02:00: quality 1.0NGC 7000 02:00–03:00: quality 0.9NGC 7000 04:00–04:10: quality 0.8NGC 7000 04:10–04:55: quality 0.4NGC 7000 04:55–05:00: quality 0.1NGC 7000 05:00–05:10: quality 0.2NGC 7000 05:10–05:35: quality 0.1observe NGC 7000 22:50–23:55V1057 CygV1057 Cyg 22:05–22:50: quality 0.2V1057 Cyg 22:50–23:00: quality 0.3V1057 Cyg 23:00–23:05: quality 0.8V1057 Cyg 23:05–01:00: quality 0.9V1057 Cyg 01:00–02:00: quality 1.0V1057 Cyg 02:00–03:00: quality 0.9V1057 Cyg 04:00–04:10: quality 0.8V1057 Cyg 04:10–04:55: quality 0.4V1057 Cyg 04:55–05:00: quality 0.1V1057 Cyg 05:00–05:10: quality 0.2V1057 Cyg 05:10–05:35: quality 0.1observe V1057 Cyg 23:55–01:00M33M33 01:00–01:10: quality 0.4M33 01:10–01:25: quality 0.5M33 01:25–01:40: quality 0.6M33 01:40–01:55: quality 0.7M33 01:55–03:00: quality 0.8M33 04:00–04:10: quality 0.8M33 04:10–04:55: quality 0.4M33 04:55–05:00: quality 0.1M33 05:00–05:35: quality 0.2observe M33 02:05–03:00observe M33 04:00–04:30scheduleNGC 7000V1057 CygM31M3322:0000:0002:0004:0006:00

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
20:45–22:50 — nothing worth pointing at — 2.08
22:50–23:55 NGC 7000 1.08 0.79
23:55–01:00 V1057 Cyg 1.08 0.92
01:00–02:05 M31 1.08 0.83
02:05–03:00 M33 0.92 0.79
03:00–04:00 — nothing worth pointing at — 1.0
04:00–04:30 M33 0.5 0.54
04:30–04:55 M45 0.42 0.34
04:55–06:10 — nothing worth pointing at — 1.25

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 72 00:15–03:00 (good) 89.7° at 06:05 150.7° 1.08
M42 Great Orion Nebula 0 0 — 42.9° at 10:55 122.7° 0.0
M45 Seven Sisters 11 7 04:20–04:55 (marginal) 72.5° at 09:10 154.8° 0.42
NGC 7000 North America Nebula 100 73 23:00–03:00 (good) 87.2° at 02:20 112.1° 1.08
V1057 Cyg 100 73 23:00–03:00 (good) 87.3° at 02:20 112.1° 1.08
M33 Triangulum Pinwheel 72 46 01:30–03:00 (good) 79.1° at 06:55 165.3° 1.42

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-07-21"

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"}.