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.

Try: an autumn deep-sky night · ← previous night · next night →

Night of Tuesday, 09 December 2025 · astronomical night 18:30 → 05:57 (11.45 h) · Moon 70% (waning gibbous) · weather: ERA5 history

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

local	target	hours	mean quality
16:50–23:00	— nothing worth pointing at —	6.17
23:00–23:35	M33	0.58	0.45
23:35–00:10	M31	0.58	0.41
00:10–00:45	M45	0.58	0.39
00:45–01:00	M42	0.25	0.31
01:00–07:40	— nothing worth pointing at —	6.67

Targets

target	astronomy	overall	best window	highest	Moon sep.	scheduled h
M31 Andromeda Galaxy	100	11	23:00–01:00 (marginal)	89.7° at 19:50	111.5°	0.58
M42 Great Orion Nebula	80	12	23:00–01:00 (marginal)	42.9° at 00:40	66.5°	0.25
M45 Seven Sisters	100	10	23:00–01:00 (marginal)	72.5° at 22:55	85.1°	0.58
NGC 7000 North America Nebula	100	0	—	87.2° at 16:05	119.8°	0.0
V1057 Cyg	100	0	—	87.3° at 16:05	119.9°	0.0
M33 Triangulum Pinwheel	100	11	23:00–01:00 (marginal)	79.1° at 20:40	109.9°	0.58

Left out

NGC 7000 — Overcast (≥80 % cloud) for 11.2 of 13.8 dark hours — the sky is closed whatever the geometry says.
V1057 Cyg — Overcast (≥80 % cloud) for 11.2 of 13.8 dark hours — the sky is closed whatever the geometry says.

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-12-09"

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"}.