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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 Saturday, 23 January 2027 · astronomical night 19:01 → 06:03 (11.04 h) · Moon 97% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:55–18:30: quality 0.2M31 18:30–18:55: quality 0.5M31 18:55–19:05: quality 0.4M31 19:05–20:00: quality 0.9M31 20:00–21:15: quality 0.8M31 21:15–22:35: quality 0.7M31 22:35–22:50: quality 0.6M31 22:50–23:10: quality 0.5M31 23:10–23:30: quality 0.4M31 23:30–23:35: quality 0.3observe M31 19:40–20:50M42M42 18:00–18:30: quality 0.1M42 18:30–18:50: quality 0.3M42 18:50–18:55: quality 0.4M42 18:55–19:05: quality 0.3M42 19:05–21:05: quality 0.6M42 21:05–23:35: quality 0.5M42 23:35–00:50: quality 0.4M42 00:50–01:20: quality 0.3M42 01:20–01:35: quality 0.2observe M42 23:10–00:45M45M45 17:55–18:05: quality 0.1M45 18:05–18:30: quality 0.2M45 18:30–18:55: quality 0.5M45 18:55–19:05: quality 0.4M45 19:05–20:15: quality 0.8M45 20:15–22:30: quality 0.7M45 22:30–23:55: quality 0.6M45 23:55–00:55: quality 0.5M45 00:55–01:15: quality 0.4M45 01:15–01:35: quality 0.3observe M45 22:00–23:10observe M45 00:45–01:25NGC 7000NGC 7000 17:55–18:30: quality 0.1NGC 7000 18:30–19:05: quality 0.4NGC 7000 19:05–19:10: quality 0.7NGC 7000 19:10–19:30: quality 0.6NGC 7000 19:30–19:50: quality 0.5NGC 7000 19:50–20:05: quality 0.4NGC 7000 06:15–06:40: quality 0.2NGC 7000 06:40–07:15: quality 0.1observe NGC 7000 18:30–19:40V1057 CygV1057 Cyg 17:55–18:30: quality 0.1V1057 Cyg 18:30–19:05: quality 0.4V1057 Cyg 19:05–19:10: quality 0.7V1057 Cyg 19:10–19:30: quality 0.6V1057 Cyg 19:30–19:50: quality 0.5V1057 Cyg 19:50–20:05: quality 0.4V1057 Cyg 06:15–06:40: quality 0.2V1057 Cyg 06:40–07:15: quality 0.1M33M33 17:55–18:30: quality 0.2M33 18:30–18:55: quality 0.5M33 18:55–19:05: quality 0.4M33 19:05–20:15: quality 0.9M33 20:15–21:30: quality 0.8M33 21:30–22:50: quality 0.7M33 22:50–23:05: quality 0.6M33 23:05–23:25: quality 0.5M33 23:25–23:40: quality 0.4M33 23:40–23:45: quality 0.3observe M33 20:50–22:00scheduleNGC 7000M31M33M45M4218:0020:0022:0000:0002:0004:0006:00

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
18:30–19:40 NGC 7000 1.17 0.49
19:40–20:50 M31 1.17 0.83
20:50–22:00 M33 1.17 0.75
22:00–23:10 M45 1.17 0.64
23:10–00:45 M42 1.58 0.43
00:45–01:25 M45 0.67 0.39
01:25–07:45 — nothing worth pointing at — 6.33

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 80 unknown 19:05–22:45 (good) 89.7° at 16:55 111.5° 1.17
M42 Great Orion Nebula 48 unknown 19:05–01:05 (marginal) 42.9° at 21:45 64.4° 1.58
M45 Seven Sisters 79 unknown 19:05–23:10 (good) 72.5° at 20:00 84.0° 1.83
NGC 7000 North America Nebula 16 unknown 19:05–19:20 (good) 87.3° at 13:10 121.4° 1.17
V1057 Cyg 16 unknown 19:05–19:20 (good) 87.3° at 13:10 121.5° 0.0
M33 Triangulum Pinwheel 83 unknown 19:05–23:00 (good) 79.1° at 17:45 109.4° 1.17

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-01-23"

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"}.