Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Triangulum Pinwheel: 01-30 (96), 01-31 (93), 02-01 (91), 02-02 (88), 02-03 (87) — by astronomy; check the weather when the night is within four days.

2046-01-30astronomy score per night — click a bar for that night2046-02-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-01-30 Tue	96	—	unknown	19:10–22:50 (good, 3.67 h)	79.2° 17:15	10.82	32%	147.7°
2046-01-31 Wed	93	—	unknown	19:15–22:45 (good, 3.5 h)	79.2° 17:15	10.79	22%	136.0°
2046-02-01 Thu	91	—	unknown	19:15–22:40 (good, 3.42 h)	79.2° 17:10	10.75	15%	124.0°
2046-02-02 Fri	88	—	unknown	19:15–22:40 (good, 3.42 h)	79.2° 17:05	10.72	8%	112.1°
2046-02-03 Sat	87	—	unknown	19:15–22:35 (good, 3.33 h)	79.2° 17:00	10.69	4%	100.3°
2046-02-04 Sun	84	—	unknown	19:20–22:30 (good, 3.17 h)	79.2° 17:00	10.65	1%	88.5°
2046-02-05 Mon	82	—	unknown	19:20–22:25 (good, 3.08 h)	79.2° 16:55	10.62	0%	76.9°
2046-02-06 Tue	80	—	unknown	19:20–22:20 (good, 3.0 h)	79.2° 16:50	10.58	1%	65.4°
2046-02-07 Wed	77	—	unknown	19:20–22:20 (good, 3.0 h)	79.2° 16:45	10.54	4%	54.1°
2046-02-08 Thu	72	—	unknown	19:20–22:15 (good, 2.92 h)	79.2° 16:40	10.51	8%	42.9°
2046-02-09 Fri	63	—	unknown	19:25–22:10 (good, 2.75 h)	79.2° 16:40	10.47	14%	32.1°
2046-02-10 Sat	54	—	unknown	19:25–22:00 (good, 2.58 h)	79.2° 16:35	10.43	21%	22.1°
2046-02-11 Sun	45	—	unknown	19:25–21:50 (good, 2.42 h)	79.2° 16:30	10.4	29%	15.1°
2046-02-12 Mon	36	—	unknown	19:25–21:35 (good, 2.17 h)	79.2° 16:25	10.36	38%	15.8°
2046-02-13 Tue	26	—	unknown	19:30–19:35 (good, 0.08 h)	79.2° 16:20	10.32	48%	23.9°
2046-02-14 Wed	20	—	unknown	19:30–22:05 (marginal, 2.58 h)	79.2° 16:20	10.28	58%	34.9°
2046-02-15 Thu	17	—	unknown	19:30–21:55 (marginal, 2.42 h)	79.2° 16:15	10.24	68%	47.2°
2046-02-16 Fri	17	—	unknown	19:30–21:50 (marginal, 2.33 h)	79.2° 16:10	10.2	78%	60.3°
2046-02-17 Sat	19	—	unknown	19:30–21:50 (marginal, 2.33 h)	79.2° 16:05	10.16	87%	74.0°
2046-02-18 Sun	23	—	unknown	19:35–19:55 (good, 0.33 h)	79.2° 16:05	10.12	94%	88.1°
2046-02-19 Mon	29	—	unknown	19:35–21:05 (good, 1.5 h)	79.2° 16:00	10.08	98%	102.7°
2046-02-20 Tue	36	—	unknown	19:35–21:15 (good, 1.67 h)	79.2° 15:55	10.03	100%	117.4°
2046-02-21 Wed	37	—	unknown	19:35–21:15 (good, 1.67 h)	79.2° 15:50	9.99	98%	132.0°
2046-02-22 Thu	41	—	unknown	19:40–21:10 (good, 1.5 h)	79.2° 15:45	9.95	94%	146.0°
2046-02-23 Fri	41	—	unknown	19:40–21:15 (good, 1.58 h)	79.2° 15:45	9.91	87%	158.5°
2046-02-24 Sat	38	—	unknown	19:40–21:10 (good, 1.5 h)	79.2° 15:40	9.86	78%	165.7°
2046-02-25 Sun	37	—	unknown	19:40–21:10 (good, 1.5 h)	79.2° 15:35	9.82	68%	161.4°
2046-02-26 Mon	35	—	unknown	19:45–21:05 (good, 1.33 h)	79.2° 15:30	9.77	58%	150.8°
2046-02-27 Tue	33	—	unknown	19:45–21:00 (good, 1.25 h)	79.2° 15:25	9.73	47%	138.9°
2046-02-28 Wed	31	—	unknown	19:45–20:55 (good, 1.17 h)	79.2° 15:25	9.69	37%	126.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-01-30&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.