Guangdong · China · 22.38° N · 112.68° E
Solar position in Changsha
Sun position, daylight and the best solar panel angle for Changsha — computed for 22.38° N, 112.68° E, 6 m above sea level.
The sun right now
Sun in Changsha today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:14 | sun 18° below horizon |
| Nautical dawn | 05:40 | 12° below |
| Civil dawn | 06:06 | 6° below |
| Sunrise | 06:29 | 103° ESE |
| Golden hour ends | 07:00 | sun 6° up |
| Solar noon | 12:13 | 55.5° high |
| Golden hour starts | 17:26 | sun 6° up |
| Sunset | 17:56 | 257° WSW |
| Civil dusk | 18:19 | 6° below |
| Nautical dusk | 18:45 | 12° below |
| Astronomical dusk | 19:11 | 18° below |
| Day length | 11 h 27 min | |
Sun path diagram for Changsha
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 88.9° at solar noon in Changsha; on the December solstice only 44.2°. Sunrise swings from 64° ENE in June to 115° ESE in December — a 51° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:10 | 12:40 | 18:10 | 10 h 59 min | 47.7° |
| February | 06:56 | 12:42 | 18:29 | 11 h 32 min | 57.1° |
| March | 06:32 | 12:36 | 18:40 | 12 h 08 min | 67.9° |
| April | 06:04 | 12:28 | 18:51 | 12 h 47 min | 79.5° |
| May | 05:47 | 12:25 | 19:04 | 13 h 17 min | 87.8° |
| June | 05:45 | 12:31 | 19:16 | 13 h 30 min | 88.9° |
| July | 05:56 | 12:35 | 19:14 | 13 h 19 min | 88.1° |
| August | 06:08 | 12:32 | 18:56 | 12 h 48 min | 79.7° |
| September | 06:17 | 12:22 | 18:26 | 12 h 09 min | 68.3° |
| October | 06:27 | 12:13 | 17:59 | 11 h 32 min | 56.9° |
| November | 06:45 | 12:14 | 17:44 | 10 h 59 min | 47.7° |
| December | 07:04 | 12:27 | 17:50 | 10 h 46 min | 44.2° |
A year of daylight in Changsha
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Changsha
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
19°collects the most energy over a year: 1185 kWh per kWp.
20°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | March kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1132 | 96% | 2.44 | 1.7× |
| 15° | 1182 | 100% | 2.54 | 1.5× |
| 19° year-round best | 1185 | 100% | 2.54 | 1.5× |
| 20° off-grid best | 1185 | 100% | 2.54 | 1.5× |
| 22° = latitude | 1184 | 100% | 2.54 | 1.5× |
| 30° | 1169 | 99% | 2.51 | 1.5× |
| 45° | 1096 | 92% | 2.37 | 1.5× |
| 60° | 966 | 82% | 2.11 | 1.7× |
| 70° | 854 | 72% | 1.89 | 1.9× |
| 90° | 605 | 51% | 1.34 | 2.5× |
A fixed array in Changsha produces the most over a year at 19°. The design month for an off-grid system is March: at 20° it makes 2.54 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Changsha at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 19° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 19° | Mean temp. |
|---|---|---|---|---|---|
| January | 2.87 | 3.17 | 2.70 | 2.78 | 14.5 °C |
| February | 2.91 | 2.65 | 2.22 | 2.61 | 17.1 °C |
| March | 3.04 | 2.30 | 1.89 | 2.54 | 20.0 °C |
| April | 3.60 | 2.26 | 1.82 | 2.86 | 23.5 °C |
| May | 4.40 | 2.24 | 1.79 | 3.34 | 26.3 °C |
| June | 4.54 | 2.11 | 1.67 | 3.36 | 27.6 °C |
| July | 5.15 | 2.33 | 1.85 | 3.83 | 28.0 °C |
| August | 4.86 | 2.66 | 2.12 | 3.75 | 28.0 °C |
| September | 4.52 | 3.14 | 2.54 | 3.69 | 26.8 °C |
| October | 4.19 | 3.70 | 3.05 | 3.69 | 23.7 °C |
| November | 3.51 | 3.86 | 3.23 | 3.35 | 20.1 °C |
| December | 3.07 | 3.73 | 3.18 | 3.08 | 15.4 °C |
| Year | 3.89 avg | 2.85 avg | 854 kWh | 1185 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 710 Wp of panels at 70°, versus 460 Wp at 19°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Changsha
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
2.8 mrow pitch at 70°
2.6 mrow pitch at 19°
How Changsha compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
795thof 2,095 places in China for sunshine, shared: 3.90 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in China: 1,185 against 1,262 kWh per kWp.
−40 mindaylight on the longest day, compared with Shanghai: 13 h 30 min against 14 h 11 min.
19°best year-round tilt here; across China it runs from 14° in Haikou to 52° in Xilinji.
Of the 2,095 places in China, Nyêmo gets the most sun (5.75 peak sun hours a day) and Baima and 11 other places the least (2.91); Changsha ranks joint 795th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 1.67 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 10 h 46 min, +39 min compared with Shanghai.
Solar forecast for Changsha, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Changsha
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Places near Changsha
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A free, live card for Changsha: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.