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 Saturday, 27 September 2025 · astronomical night 20:42 → 05:41 (9.0 h) · Moon 31% (waxing crescent) · 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
19:05–20:10	— nothing worth pointing at —	1.08
20:10–20:45	NGC 7000	0.58	0.45
20:45–21:00	V1057 Cyg	0.25	0.91
21:00–22:00	— nothing worth pointing at —	1.0
22:00–22:30	V1057 Cyg	0.5	0.48
22:30–23:00	M31	0.5	0.47
23:00–07:15	— nothing worth pointing at —	8.25

Targets

target	astronomy	overall	best window	highest	Moon sep.	scheduled h
M31 Andromeda Galaxy	100	12	20:45–21:00 (good)	89.5° at 01:35	130.2°	0.5
M42 Great Orion Nebula	57	0	—	42.9° at 06:30	144.5°	0.0
M45 Seven Sisters	100	0	—	72.5° at 04:40	167.6°	0.0
NGC 7000 North America Nebula	100	16	20:45–21:00 (good)	87.2° at 21:55	93.0°	0.58
V1057 Cyg	100	16	20:45–21:00 (good)	87.3° at 21:55	92.9°	0.75
M33 Triangulum Pinwheel	100	9	22:00–23:00 (marginal)	79.1° at 02:30	139.6°	0.0

Left out

M42 — Overcast (≥80 % cloud) for 7.8 of 11.2 dark hours — the sky is closed whatever the geometry says.
M45 — Overcast (≥80 % cloud) for 7.8 of 11.2 dark hours — the sky is closed whatever the geometry says.
M33 — its best window (22:00–23:00) is outranked by M31, V1057 Cyg

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2025-09-27"

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"}.