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: 01-31 (93), 02-01 (88), 02-02 (80), 02-03 (67), 02-04 (53) — by astronomy; check the weather when the night is within four days.

2033-01-31astronomy score per night — click a bar for that night2033-03-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-01-31 Mon	93	—	unknown	19:15–22:45 (good, 3.5 h)	79.1° 17:10	10.78	2%	66.5°
2033-02-01 Tue	88	—	unknown	19:15–22:40 (good, 3.42 h)	79.1° 17:10	10.75	6%	52.7°
2033-02-02 Wed	80	—	unknown	19:15–22:35 (good, 3.33 h)	79.1° 17:05	10.71	13%	39.6°
2033-02-03 Thu	67	—	unknown	19:15–22:35 (good, 3.33 h)	79.1° 17:00	10.68	22%	28.2°
2033-02-04 Fri	53	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:55	10.65	32%	20.9°
2033-02-05 Sat	40	—	unknown	19:20–21:55 (good, 2.58 h)	79.1° 16:50	10.61	43%	21.7°
2033-02-06 Sun	29	—	unknown	19:20–22:45 (marginal, 3.42 h)	79.1° 16:50	10.58	54%	29.3°
2033-02-07 Mon	24	—	unknown	19:20–22:30 (marginal, 3.17 h)	79.1° 16:45	10.54	65%	39.8°
2033-02-08 Tue	22	—	unknown	19:20–22:25 (marginal, 3.08 h)	79.1° 16:40	10.5	74%	51.2°
2033-02-09 Wed	22	—	unknown	19:25–22:20 (marginal, 2.92 h)	79.1° 16:35	10.47	82%	62.8°
2033-02-10 Thu	26	—	unknown	19:25–22:20 (marginal, 2.92 h)	79.1° 16:35	10.43	89%	74.5°
2033-02-11 Fri	30	—	unknown	19:25–20:10 (good, 0.75 h)	79.1° 16:30	10.39	95%	86.1°
2033-02-12 Sat	36	—	unknown	19:25–21:05 (good, 1.67 h)	79.1° 16:25	10.35	98%	97.5°
2033-02-13 Sun	41	—	unknown	19:30–21:30 (good, 2.0 h)	79.1° 16:20	10.31	100%	108.8°
2033-02-14 Mon	48	—	unknown	19:30–21:35 (good, 2.08 h)	79.1° 16:15	10.27	100%	119.9°
2033-02-15 Tue	48	—	unknown	19:30–21:35 (good, 2.08 h)	79.1° 16:15	10.23	98%	130.7°
2033-02-16 Wed	52	—	unknown	19:30–21:35 (good, 2.08 h)	79.1° 16:10	10.19	94%	140.9°
2033-02-17 Thu	51	—	unknown	19:35–21:30 (good, 1.92 h)	79.1° 16:05	10.15	88%	150.2°
2033-02-18 Fri	50	—	unknown	19:35–21:35 (good, 2.0 h)	79.1° 16:00	10.11	82%	157.3°
2033-02-19 Sat	48	—	unknown	19:35–21:30 (good, 1.92 h)	79.1° 15:55	10.07	74%	159.7°
2033-02-20 Sun	46	—	unknown	19:35–21:25 (good, 1.83 h)	79.1° 15:55	10.03	65%	155.8°
2033-02-21 Mon	44	—	unknown	19:35–21:20 (good, 1.75 h)	79.1° 15:50	9.99	56%	147.6°
2033-02-22 Tue	41	—	unknown	19:40–21:20 (good, 1.67 h)	79.1° 15:45	9.94	46%	137.2°
2033-02-23 Wed	40	—	unknown	19:40–21:15 (good, 1.58 h)	79.1° 15:40	9.9	35%	125.7°
2033-02-24 Thu	38	—	unknown	19:40–21:10 (good, 1.5 h)	79.1° 15:40	9.86	25%	113.4°
2033-02-25 Fri	36	—	unknown	19:40–21:05 (good, 1.42 h)	79.1° 15:35	9.81	16%	100.4°
2033-02-26 Sat	34	—	unknown	19:45–21:00 (good, 1.25 h)	79.1° 15:30	9.77	9%	86.8°
2033-02-27 Sun	32	—	unknown	19:45–21:00 (good, 1.25 h)	79.1° 15:25	9.72	3%	73.0°
2033-02-28 Mon	31	—	unknown	19:45–20:55 (good, 1.17 h)	79.1° 15:20	9.68	0%	59.0°
2033-03-01 Tue	29	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:20	9.63	1%	45.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-01-31&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.