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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, 12 January 2027 · astronomical night 18:50 → 06:08 (11.29 h) · Moon 22% (waxing crescent) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:45–18:20: quality 0.1M31 18:20–18:55: quality 0.4M31 18:55–21:25: quality 0.9M31 21:25–21:45: quality 0.8M31 21:45–22:30: quality 0.9M31 22:30–23:20: quality 0.8M31 23:20–23:40: quality 0.7M31 23:40–23:55: quality 0.6M31 23:55–00:10: quality 0.5M31 00:10–00:20: quality 0.4observe M31 18:20–19:40M42M42 18:45–18:55: quality 0.2M42 18:55–19:10: quality 0.5M42 19:10–19:30: quality 0.6M42 19:30–19:45: quality 0.7M42 19:45–21:45: quality 0.8M42 21:45–00:15: quality 0.9M42 00:15–01:25: quality 0.8M42 01:25–01:40: quality 0.7M42 01:40–01:55: quality 0.6M42 01:55–02:10: quality 0.5M42 02:10–02:20: quality 0.4observe M42 23:15–02:20M45M45 17:45–18:20: quality 0.1M45 18:20–18:30: quality 0.4M45 18:30–18:55: quality 0.5M45 18:55–21:45: quality 0.9M45 21:45–23:25: quality 1.0M45 23:25–00:45: quality 0.9M45 00:45–01:30: quality 0.8M45 01:30–01:45: quality 0.7M45 01:45–02:00: quality 0.6M45 02:00–02:10: quality 0.5M45 02:10–02:20: quality 0.4observe M45 21:55–23:15NGC 7000NGC 7000 17:45–18:20: quality 0.1NGC 7000 18:20–18:55: quality 0.4NGC 7000 18:55–19:10: quality 0.8NGC 7000 19:10–19:55: quality 0.7NGC 7000 19:55–20:15: quality 0.6NGC 7000 20:15–20:35: quality 0.5NGC 7000 20:35–20:50: quality 0.4NGC 7000 07:00–07:20: quality 0.1observe NGC 7000 19:40–20:35V1057 CygV1057 Cyg 17:45–18:20: quality 0.1V1057 Cyg 18:20–18:55: quality 0.4V1057 Cyg 18:55–19:10: quality 0.8V1057 Cyg 19:10–19:55: quality 0.7V1057 Cyg 19:55–20:15: quality 0.6V1057 Cyg 20:15–20:30: quality 0.5V1057 Cyg 20:30–20:50: quality 0.4V1057 Cyg 07:00–07:20: quality 0.1M33M33 17:45–18:20: quality 0.1M33 18:20–18:55: quality 0.4M33 18:55–22:50: quality 0.9M33 22:50–23:40: quality 0.8M33 23:40–23:55: quality 0.7M33 23:55–00:10: quality 0.6M33 00:10–00:20: quality 0.5M33 00:20–00:30: quality 0.4observe M33 20:35–21:55scheduleM31NGC 7000M33M45M4218:0020:0022:0000:0002:0004:0006:00

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
17:10–18:20 — nothing worth pointing at — 1.17
18:20–19:40 M31 1.33 0.7
19:40–20:35 NGC 7000 0.92 0.58
20:35–21:55 M33 1.33 0.9
21:55–23:15 M45 1.33 0.99
23:15–02:20 M42 3.08 0.76
02:20–07:50 — nothing worth pointing at — 5.5

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 91 unknown 18:55–23:45 (good) 89.5° at 17:40 48.3° 1.33
M42 Great Orion Nebula 89 unknown 19:20–01:50 (good) 42.9° at 22:30 95.4° 3.08
M45 Seven Sisters 100 unknown 18:55–01:50 (good) 72.5° at 20:40 71.4° 1.33
NGC 7000 North America Nebula 29 unknown 18:55–20:05 (good) 87.2° at 13:55 55.5° 0.92
V1057 Cyg 29 unknown 18:55–20:05 (good) 87.3° at 13:55 55.4° 0.0
M33 Triangulum Pinwheel 93 unknown 18:55–00:00 (good) 79.1° at 18:30 47.2° 1.33

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2027-01-12"

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"}.