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: 02-16 (52), 02-17 (51), 02-18 (50), 02-14 (48), 02-15 (48) — by astronomy; check the weather when the night is within four days.

2033-02-13astronomy score per night — click a bar for that night2033-03-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2033-03-02 Wed	26	—	unknown	19:50–20:45 (good, 0.92 h)	79.1° 15:15	9.59	4%	32.7°
2033-03-03 Thu	23	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:10	9.54	10%	23.1°
2033-03-04 Fri	19	—	unknown	19:50–20:30 (good, 0.67 h)	79.1° 15:05	9.49	18%	20.6°
2033-03-05 Sat	15	—	unknown	19:50–20:15 (good, 0.42 h)	79.1° 15:00	9.45	28%	26.7°
2033-03-06 Sun	12	—	unknown	19:50–20:05 (good, 0.25 h)	79.1° 15:00	9.4	38%	36.9°
2033-03-07 Mon	9	—	unknown	19:55–20:55 (marginal, 1.0 h)	79.1° 14:55	9.35	49%	48.4°
2033-03-08 Tue	8	—	unknown	19:55–20:45 (marginal, 0.83 h)	79.1° 14:50	9.31	59%	60.1°
2033-03-09 Wed	7	—	unknown	19:55–20:40 (marginal, 0.75 h)	79.1° 14:45	9.26	69%	71.8°
2033-03-10 Thu	6	—	unknown	19:55–20:40 (marginal, 0.75 h)	79.1° 14:45	9.21	78%	83.3°
2033-03-11 Fri	6	—	unknown	20:00–20:40 (marginal, 0.67 h)	79.1° 14:40	9.16	85%	94.8°
2033-03-12 Sat	6	—	unknown	20:00–20:35 (marginal, 0.58 h)	79.1° 14:35	9.11	91%	106.0°
2033-03-13 Sun	6	—	unknown	20:00–20:30 (marginal, 0.5 h)	79.1° 14:30	9.06	96%	117.1°
2033-03-14 Mon	6	—	unknown	20:00–20:30 (marginal, 0.5 h)	79.1° 14:25	9.01	99%	127.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-02-13&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.