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: 02-02 (87), 02-03 (86), 02-04 (86), 02-05 (83), 02-06 (81) — by astronomy; check the weather when the night is within four days.

2048-02-02astronomy score per night — click a bar for that night2048-03-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2048-02-02 Sun	87	—	unknown	19:15–22:30 (good, 3.25 h)	79.2° 17:10	10.74	90%	135.2°
2048-02-03 Mon	86	—	unknown	19:15–22:30 (good, 3.25 h)	79.2° 17:05	10.7	83%	147.6°
2048-02-04 Tue	86	—	unknown	19:15–22:30 (good, 3.25 h)	79.2° 17:00	10.67	74%	158.8°
2048-02-05 Wed	83	—	unknown	19:20–22:30 (good, 3.17 h)	79.2° 16:55	10.63	63%	165.2°
2048-02-06 Thu	81	—	unknown	19:20–22:25 (good, 3.08 h)	79.2° 16:50	10.6	52%	160.7°
2048-02-07 Fri	78	—	unknown	19:20–22:20 (good, 3.0 h)	79.2° 16:50	10.56	41%	149.7°
2048-02-08 Sat	76	—	unknown	19:20–22:15 (good, 2.92 h)	79.2° 16:45	10.53	30%	136.9°
2048-02-09 Sun	72	—	unknown	19:25–22:15 (good, 2.83 h)	79.2° 16:40	10.49	20%	123.5°
2048-02-10 Mon	71	—	unknown	19:25–22:10 (good, 2.75 h)	79.2° 16:35	10.45	12%	109.9°
2048-02-11 Tue	68	—	unknown	19:25–22:05 (good, 2.67 h)	79.2° 16:30	10.41	5%	96.2°
2048-02-12 Wed	66	—	unknown	19:25–22:00 (good, 2.58 h)	79.2° 16:30	10.38	2%	82.6°
2048-02-13 Thu	64	—	unknown	19:25–21:55 (good, 2.5 h)	79.2° 16:25	10.34	0%	69.3°
2048-02-14 Fri	60	—	unknown	19:30–21:55 (good, 2.42 h)	79.2° 16:20	10.3	1%	56.3°
2048-02-15 Sat	58	—	unknown	19:30–21:50 (good, 2.33 h)	79.2° 16:15	10.26	4%	43.9°
2048-02-16 Sun	53	—	unknown	19:30–21:45 (good, 2.25 h)	79.2° 16:15	10.22	10%	32.2°
2048-02-17 Mon	46	—	unknown	19:30–21:35 (good, 2.08 h)	79.2° 16:10	10.18	16%	21.9°
2048-02-18 Tue	38	—	unknown	19:35–21:25 (good, 1.83 h)	79.2° 16:05	10.14	24%	15.4°
2048-02-19 Wed	30	—	unknown	19:35–21:15 (good, 1.67 h)	79.2° 16:00	10.1	33%	16.9°
2048-02-20 Thu	24	—	unknown	19:35–20:20 (good, 0.75 h)	79.2° 15:55	10.05	42%	24.7°
2048-02-21 Fri	19	—	unknown	19:35–21:45 (marginal, 2.17 h)	79.2° 15:55	10.01	51%	34.8°
2048-02-22 Sat	15	—	unknown	19:40–21:40 (marginal, 2.0 h)	79.2° 15:50	9.97	61%	45.6°
2048-02-23 Sun	14	—	unknown	19:40–21:30 (marginal, 1.83 h)	79.2° 15:45	9.93	70%	56.9°
2048-02-24 Mon	14	—	unknown	19:40–21:30 (marginal, 1.83 h)	79.2° 15:40	9.88	78%	68.5°
2048-02-25 Tue	16	—	unknown	19:40–21:30 (marginal, 1.83 h)	79.2° 15:35	9.84	86%	80.5°
2048-02-26 Wed	18	—	unknown	19:40–20:00 (good, 0.33 h)	79.2° 15:35	9.8	92%	92.7°
2048-02-27 Thu	21	—	unknown	19:45–20:40 (good, 0.92 h)	79.2° 15:30	9.75	97%	105.3°
2048-02-28 Fri	24	—	unknown	19:45–20:45 (good, 1.0 h)	79.2° 15:25	9.71	99%	118.1°
2048-02-29 Sat	25	—	unknown	19:45–20:45 (good, 1.0 h)	79.2° 15:20	9.66	100%	131.0°
2048-03-01 Sun	25	—	unknown	19:45–20:40 (good, 0.92 h)	79.2° 15:20	9.62	98%	143.9°
2048-03-02 Mon	26	—	unknown	19:50–20:45 (good, 0.92 h)	79.2° 15:15	9.57	93%	155.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2048-02-02&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.