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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, 18 August 2026 · astronomical night 22:00 → 04:49 (6.81 h) · Moon 39% (waxing crescent) · weather: ERA5 history

M31M31 21:40–22:00: quality 0.1M31 22:00–22:05: quality 0.2M31 22:05–22:15: quality 0.4M31 22:15–22:35: quality 0.5M31 22:35–00:00: quality 0.6M31 00:00–01:15: quality 0.9M31 01:15–02:00: quality 1.0M31 02:00–03:00: quality 0.6M31 03:00–04:00: quality 0.3M31 04:00–04:50: quality 0.2M31 04:50–05:30: quality 0.1M31 06:00–06:05: quality 0.1observe M31 00:00–01:00M42M45M45 01:45–01:55: quality 0.4M45 01:55–02:00: quality 0.5M45 02:00–02:15: quality 0.3M45 02:15–02:35: quality 0.4M45 02:35–03:00: quality 0.5M45 03:00–04:00: quality 0.2M45 04:00–05:30: quality 0.1M45 06:00–06:05: quality 0.1observe M45 02:00–03:00NGC 7000NGC 7000 20:50–21:25: quality 0.1NGC 7000 21:25–22:00: quality 0.2NGC 7000 22:00–22:05: quality 0.4NGC 7000 22:05–22:40: quality 0.7NGC 7000 22:40–23:00: quality 0.8NGC 7000 23:00–00:00: quality 0.7NGC 7000 00:00–02:00: quality 1.0NGC 7000 02:00–03:00: quality 0.6NGC 7000 03:00–03:40: quality 0.3NGC 7000 03:40–04:00: quality 0.2NGC 7000 04:00–05:30: quality 0.1NGC 7000 06:00–06:05: quality 0.1observe NGC 7000 23:00–00:00V1057 CygV1057 Cyg 20:50–21:25: quality 0.1V1057 Cyg 21:25–22:00: quality 0.2V1057 Cyg 22:00–22:05: quality 0.4V1057 Cyg 22:05–22:40: quality 0.7V1057 Cyg 22:40–23:00: quality 0.8V1057 Cyg 23:00–00:00: quality 0.7V1057 Cyg 00:00–02:00: quality 1.0V1057 Cyg 02:00–03:00: quality 0.6V1057 Cyg 03:00–03:40: quality 0.3V1057 Cyg 03:40–04:00: quality 0.2V1057 Cyg 04:00–05:30: quality 0.1V1057 Cyg 06:00–06:05: quality 0.1observe V1057 Cyg 22:00–23:00M33M33 23:10–23:25: quality 0.3M33 23:25–23:45: quality 0.4M33 23:45–00:00: quality 0.5M33 00:00–00:05: quality 0.7M33 00:05–01:05: quality 0.8M33 01:05–02:00: quality 0.9M33 02:00–02:10: quality 0.5M33 02:10–03:00: quality 0.6M33 03:00–04:00: quality 0.3M33 04:00–04:50: quality 0.2M33 04:50–05:30: quality 0.1M33 06:00–06:05: quality 0.1observe M33 01:00–02:00scheduleV1057 CygNGC 7000M31M33M4522:0000:0002:0004:0006:00

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
20:15–22:00 — nothing worth pointing at — 1.75
22:00–23:00 V1057 Cyg 1.0 0.7
23:00–00:00 NGC 7000 1.0 0.71
00:00–01:00 M31 1.0 0.9
01:00–02:00 M33 1.0 0.88
02:00–03:00 M45 1.0 0.41
03:00–06:35 — nothing worth pointing at — 3.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 60 23:25–02:00 (good) 89.7° at 04:15 148.5° 1.0
M42 Great Orion Nebula 0 0 — 42.9° at 09:05 128.7° 0.0
M45 Seven Sisters 69 23 01:45–03:00 (marginal) 72.5° at 07:20 163.0° 1.0
NGC 7000 North America Nebula 100 62 22:05–02:00 (good) 87.2° at 00:30 108.3° 1.0
V1057 Cyg 100 62 22:05–02:00 (good) 87.3° at 00:30 108.4° 1.0
M33 Triangulum Pinwheel 100 56 00:00–02:00 (good) 79.1° at 05:05 162.9° 1.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-08-18"

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"}.