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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, 18 September 2026 · astronomical night 20:59 → 05:31 (8.53 h) · Moon 51% (first quarter) · weather: ERA5 history

M31M31 19:25–19:55: unusableM31 19:55–20:35: poorM31 20:35–21:15: marginalM31 21:15–05:35: goodM31 05:35–06:00: marginalM31 06:00–06:40: poorM31 06:40–07:10: unusableobserve M31 23:50–01:30M42M42 19:25–03:20: unusableM42 03:20–03:55: marginalM42 03:55–05:35: goodM42 05:35–06:00: marginalM42 06:00–06:40: poorM42 06:40–07:10: unusableobserve M42 04:50–06:00M45M45 19:25–23:45: unusableM45 23:45–00:15: marginalM45 00:15–05:35: goodM45 05:35–06:00: marginalM45 06:00–06:40: poorM45 06:40–07:10: unusableobserve M45 03:10–04:50NGC 7000NGC 7000 19:25–19:55: unusableNGC 7000 19:55–20:30: poorNGC 7000 20:30–21:00: marginalNGC 7000 21:00–04:50: goodNGC 7000 04:50–05:25: marginalNGC 7000 05:25–07:10: unusableobserve NGC 7000 20:30–22:10V1057 CygV1057 Cyg 19:25–19:55: unusableV1057 Cyg 19:55–20:30: poorV1057 Cyg 20:30–21:00: marginalV1057 Cyg 21:00–04:45: goodV1057 Cyg 04:45–05:25: marginalV1057 Cyg 05:25–07:10: unusableobserve V1057 Cyg 22:10–23:50M33M33 19:25–21:10: unusableM33 21:10–22:40: marginalM33 22:40–05:35: goodM33 05:35–06:00: marginalM33 06:00–06:40: poorM33 06:40–07:10: unusableobserve M33 01:30–03:10scheduleNGC 7000V1057 CygM31M33M45M4220:0022:0000:0002:0004:0006:00

Faded bands: each target's own windows (green good, amber marginal, pink poor). Dark blue: the schedule. Grey columns: twilight.

Schedule

localtargethoursmean quality
19:25–20:30 — nothing worth pointing at — 1.08
20:30–22:10 NGC 7000 1.67 0.57
22:10–23:50 V1057 Cyg 1.67 0.71
23:50–01:30 M31 1.67 0.89
01:30–03:10 M33 1.67 0.92
03:10–04:50 M45 1.67 0.98
04:50–06:00 M42 1.17 0.59
06:00–07:10 — nothing worth pointing at — 1.17

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 87 21:15–05:35 (good) 89.6° at 02:15 118.4° 1.67
M42 Great Orion Nebula 41 37 03:55–05:35 (good) 42.9° at 07:05 146.5° 1.17
M45 Seven Sisters 100 91 00:15–05:35 (good) 72.5° at 05:15 153.1° 1.67
NGC 7000 North America Nebula 100 87 21:00–04:50 (good) 87.3° at 22:30 84.8° 1.67
V1057 Cyg 100 87 21:00–04:45 (good) 87.3° at 22:30 84.8° 1.67
M33 Triangulum Pinwheel 100 87 22:40–05:35 (good) 79.1° at 03:05 125.9° 1.67
💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-09-18"

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"}.