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: 02-28 (31), 02-25 (30), 02-29 (30), 02-26 (29), 03-01 (29) — by astronomy; check the weather when the night is within four days.

2032-02-18astronomy score per night — click a bar for that night2032-03-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-18 Wed	19	—	unknown	19:35–21:55 (marginal, 2.33 h)	79.1° 16:05	10.14	58%	41.2°
2032-02-19 Thu	17	—	unknown	19:35–21:50 (marginal, 2.25 h)	79.1° 16:00	10.1	67%	52.2°
2032-02-20 Fri	17	—	unknown	19:35–21:45 (marginal, 2.17 h)	79.1° 15:55	10.06	76%	63.3°
2032-02-21 Sat	18	—	unknown	19:35–21:40 (marginal, 2.08 h)	79.1° 15:55	10.02	84%	74.5°
2032-02-22 Sun	20	—	unknown	19:35–19:40 (good, 0.08 h)	79.1° 15:50	9.98	90%	85.7°
2032-02-23 Mon	22	—	unknown	19:40–20:30 (good, 0.83 h)	79.1° 15:45	9.93	95%	97.0°
2032-02-24 Tue	26	—	unknown	19:40–20:50 (good, 1.17 h)	79.1° 15:40	9.89	98%	108.1°
2032-02-25 Wed	30	—	unknown	19:40–20:55 (good, 1.25 h)	79.1° 15:35	9.85	100%	119.3°
2032-02-26 Thu	29	—	unknown	19:40–20:55 (good, 1.25 h)	79.1° 15:35	9.8	100%	130.3°
2032-02-27 Fri	28	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:30	9.76	98%	141.1°
2032-02-28 Sat	31	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:25	9.71	94%	151.1°
2032-02-29 Sun	30	—	unknown	19:45–20:55 (good, 1.17 h)	79.1° 15:20	9.67	88%	158.9°
2032-03-01 Mon	29	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:15	9.62	81%	161.3°
2032-03-02 Tue	26	—	unknown	19:50–20:45 (good, 0.92 h)	79.1° 15:15	9.58	72%	156.1°
2032-03-03 Wed	25	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:10	9.53	62%	146.5°
2032-03-04 Thu	23	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:05	9.48	52%	135.0°
2032-03-05 Fri	21	—	unknown	19:50–20:35 (good, 0.75 h)	79.1° 15:00	9.44	40%	122.4°
2032-03-06 Sat	20	—	unknown	19:55–20:30 (good, 0.58 h)	79.1° 14:55	9.39	30%	109.2°
2032-03-07 Sun	18	—	unknown	19:55–20:25 (good, 0.5 h)	79.1° 14:55	9.34	20%	95.6°
2032-03-08 Mon	16	—	unknown	19:55–20:20 (good, 0.42 h)	79.1° 14:50	9.29	11%	81.6°
2032-03-09 Tue	14	—	unknown	19:55–20:20 (good, 0.42 h)	79.1° 14:45	9.25	5%	67.5°
2032-03-10 Wed	13	—	unknown	19:55–20:15 (good, 0.33 h)	79.1° 14:40	9.2	1%	53.5°
2032-03-11 Thu	10	—	unknown	20:00–20:10 (good, 0.17 h)	79.1° 14:40	9.15	0%	40.1°
2032-03-12 Fri	9	—	unknown	20:00–20:05 (good, 0.08 h)	79.1° 14:35	9.1	2%	28.1°
2032-03-13 Sat	7	—	unknown	19:30–20:30 (marginal, 1.0 h)	79.1° 14:30	9.05	7%	19.9°
2032-03-14 Sun	6	—	unknown	20:00–20:25 (marginal, 0.42 h)	79.1° 14:25	9.0	14%	19.8°
2032-03-15 Mon	4	—	unknown	20:05–20:25 (marginal, 0.33 h)	79.1° 14:20	8.95	22%	27.3°
2032-03-16 Tue	3	—	unknown	20:05–20:20 (marginal, 0.25 h)	79.1° 14:20	8.9	31%	37.6°
2032-03-17 Wed	2	—	unknown	20:05–20:15 (marginal, 0.17 h)	79.1° 14:15	8.85	41%	48.8°
2032-03-18 Thu	1	—	unknown	20:05–20:10 (marginal, 0.08 h)	79.1° 14:10	8.8	51%	60.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-18&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.