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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, 17 July 2026 · astronomical night 22:54 → 03:59 (5.08 h) · Moon 16% (waxing crescent) · weather: ERA5 history

M31M31 23:45–23:55: quality 0.4M31 23:55–00:10: quality 0.5M31 00:10–00:25: quality 0.6M31 00:25–00:40: quality 0.7M31 00:40–02:00: quality 0.8M31 02:00–03:20: quality 0.9M31 03:20–04:00: quality 1.0M31 04:00–04:50: quality 0.5M31 04:50–05:00: quality 0.1M31 05:00–05:30: quality 0.2observe M31 00:50–02:10observe M31 04:00–04:30M42M45M45 03:50–04:00: quality 0.4M45 04:00–04:05: quality 0.2M45 04:05–04:35: quality 0.3M45 04:35–04:50: quality 0.4M45 04:50–05:30: quality 0.1observe M45 03:50–04:00observe M45 04:30–04:50NGC 7000NGC 7000 21:30–22:10: quality 0.1NGC 7000 22:10–22:55: quality 0.4NGC 7000 22:55–23:30: quality 0.9NGC 7000 23:30–04:00: quality 1.0NGC 7000 04:00–04:50: quality 0.5NGC 7000 04:50–05:00: quality 0.1NGC 7000 05:00–05:25: quality 0.2NGC 7000 05:25–05:30: quality 0.1observe NGC 7000 22:10–23:30V1057 CygV1057 Cyg 21:30–22:10: quality 0.1V1057 Cyg 22:10–22:55: quality 0.4V1057 Cyg 22:55–23:30: quality 0.9V1057 Cyg 23:30–04:00: quality 1.0V1057 Cyg 04:00–04:50: quality 0.5V1057 Cyg 04:50–05:00: quality 0.1V1057 Cyg 05:00–05:25: quality 0.2V1057 Cyg 05:25–05:30: quality 0.1observe V1057 Cyg 23:30–00:50M33M33 01:15–01:25: quality 0.4M33 01:25–01:40: quality 0.5M33 01:40–01:55: quality 0.6M33 01:55–02:05: quality 0.7M33 02:05–02:55: quality 0.8M33 02:55–03:00: quality 0.9M33 03:00–03:10: quality 0.8M33 03:10–04:00: quality 0.9M33 04:00–04:50: quality 0.5M33 04:50–05:00: quality 0.1M33 05:00–05:30: quality 0.2observe M33 02:10–03:50scheduleNGC 7000V1057 CygM31M33M3122:0000:0002:0004:0006:00

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
20:50–22:10 — nothing worth pointing at — 1.33
22:10–23:30 NGC 7000 1.33 0.65
23:30–00:50 V1057 Cyg 1.33 0.99
00:50–02:10 M31 1.33 0.82
02:10–03:50 M33 1.67 0.85
03:50–04:00 M45 0.17 0.42
04:00–04:30 M31 0.5 0.49
04:30–04:50 M45 0.33 0.37
04:50–06:05 — nothing worth pointing at — 1.25

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 98 00:20–04:00 (good) 89.6° at 06:20 127.1° 1.83
M42 Great Orion Nebula 0 0 — 42.9° at 11:15 80.6° 0.0
M45 Seven Sisters 5 5 04:20–04:50 (marginal) 72.5° at 09:25 103.2° 0.5
NGC 7000 North America Nebula 100 98 22:55–04:00 (good) 87.2° at 02:40 123.6° 1.33
V1057 Cyg 100 98 22:55–04:00 (good) 87.3° at 02:40 123.7° 1.33
M33 Triangulum Pinwheel 61 60 01:50–04:00 (good) 79.1° at 07:10 127.5° 1.67

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-07-17"

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"}.