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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 Monday, 13 January 2031 · astronomical night 18:51 → 06:07 (11.27 h) · Moon 76% (waning gibbous) · weather: none — the schedule is astronomy only; overall conditions unknown

M31M31 17:45–18:20: quality 0.2M31 18:20–18:55: quality 0.5M31 18:55–21:00: quality 1.0M31 21:00–22:20: quality 0.9M31 22:20–23:05: quality 0.8M31 23:05–23:25: quality 0.7M31 23:25–23:45: quality 0.6M31 23:45–00:00: quality 0.5M31 00:00–00:15: quality 0.4observe M31 18:20–19:40M42M42 18:40–18:55: quality 0.2M42 18:55–19:05: quality 0.5M42 19:05–19:20: quality 0.6M42 19:20–19:35: quality 0.7M42 19:35–20:45: quality 0.8M42 20:45–22:20: quality 0.9M42 22:20–22:25: quality 0.8M42 22:25–00:40: quality 0.7M42 00:40–01:25: quality 0.6M42 01:25–01:45: quality 0.5M42 01:45–02:05: quality 0.4M42 02:05–02:15: quality 0.3observe M42 23:10–01:15M45M45 17:45–18:20: quality 0.1M45 18:20–18:55: quality 0.5M45 18:55–22:20: quality 1.0M45 22:20–23:25: quality 0.9M45 23:25–00:45: quality 0.8M45 00:45–01:30: quality 0.7M45 01:30–01:45: quality 0.6M45 01:45–02:00: quality 0.5M45 02:00–02:15: quality 0.4observe M45 21:50–23:10observe M45 01:15–02:15NGC 7000NGC 7000 17:45–18:20: quality 0.1NGC 7000 18:20–18:55: quality 0.4NGC 7000 18:55–19:45: quality 0.8NGC 7000 19:45–20:00: quality 0.7NGC 7000 20:00–20:20: quality 0.6NGC 7000 20:20–20:35: quality 0.5NGC 7000 20:35–20:45: quality 0.4NGC 7000 06:55–07:20: quality 0.1observe NGC 7000 19:40–20:30V1057 CygV1057 Cyg 17:45–18:20: quality 0.1V1057 Cyg 18:20–18:55: quality 0.4V1057 Cyg 18:55–19:45: quality 0.8V1057 Cyg 19:45–20:00: quality 0.7V1057 Cyg 20:00–20:20: quality 0.6V1057 Cyg 20:20–20:35: quality 0.5V1057 Cyg 20:35–20:45: quality 0.4V1057 Cyg 06:55–07:20: quality 0.1M33M33 17:45–18:20: quality 0.2M33 18:20–18:55: quality 0.5M33 18:55–21:25: quality 1.0M33 21:25–22:20: quality 0.9M33 22:20–23:20: quality 0.8M33 23:20–23:40: quality 0.7M33 23:40–23:55: quality 0.6M33 23:55–00:15: quality 0.5M33 00:15–00:25: quality 0.4observe M33 20:30–21:50scheduleM31NGC 7000M33M45M42M4518:0020:0022:0000:0002:0004:0006:00

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 0.78
19:40–20:30 NGC 7000 0.83 0.63
20:30–21:50 M33 1.33 0.97
21:50–23:10 M45 1.33 0.94
23:10–01:15 M42 2.08 0.67
01:15–02:15 M45 1.0 0.54
02:15–07:50 — nothing worth pointing at — 5.58

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 unknown 18:55–23:35 (good) 89.7° at 17:35 136.2° 1.33
M42 Great Orion Nebula 89 unknown 19:10–01:15 (good) 42.9° at 22:25 86.8° 2.08
M45 Seven Sisters 100 unknown 18:55–01:35 (good) 72.5° at 20:35 112.5° 2.33
NGC 7000 North America Nebula 34 unknown 18:55–20:10 (good) 87.2° at 13:50 126.5° 0.83
V1057 Cyg 34 unknown 18:55–20:10 (good) 87.3° at 13:50 126.6° 0.0
M33 Triangulum Pinwheel 100 unknown 18:55–23:50 (good) 79.1° at 18:25 137.4° 1.33

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2031-01-13"

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"}.