Madhesh · Nepal · 26.54° N · 86.75° E
Solar position in Rājbirāj
Sun position, daylight and the best solar panel angle for Rājbirāj — computed for 26.54° N, 86.75° E, 89 m above sea level.
The sun right now
Sun in Rājbirāj today
Sunday, 25 October 2026 · local time UTC+5:45
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:44 | sun 18° below horizon |
| Nautical dawn | 05:11 | 12° below |
| Civil dawn | 05:39 | 6° below |
| Sunrise | 06:02 | 103° ESE |
| Golden hour ends | 06:34 | sun 6° up |
| Solar noon | 11:41 | 51.4° high |
| Golden hour starts | 16:49 | sun 6° up |
| Sunset | 17:21 | 257° WSW |
| Civil dusk | 17:44 | 6° below |
| Nautical dusk | 18:11 | 12° below |
| Astronomical dusk | 18:38 | 18° below |
| Day length | 11 h 18 min | |
Sun path diagram for Rājbirāj
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 86.9° at solar noon in Rājbirāj; on the December solstice only 40.0°. Sunrise swings from 63° ENE in June to 116° ESE in December — a 53° 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 | 06:46 | 12:09 | 17:31 | 10 h 45 min | 43.6° |
| February | 06:29 | 12:11 | 17:54 | 11 h 25 min | 52.9° |
| March | 06:01 | 12:05 | 18:09 | 12 h 08 min | 63.7° |
| April | 05:29 | 11:56 | 18:24 | 12 h 56 min | 75.3° |
| May | 05:08 | 11:54 | 18:41 | 13 h 33 min | 83.7° |
| June | 05:05 | 11:59 | 18:54 | 13 h 48 min | 86.9° |
| July | 05:17 | 12:04 | 18:51 | 13 h 34 min | 83.9° |
| August | 05:32 | 12:01 | 18:29 | 12 h 57 min | 75.6° |
| September | 05:45 | 11:51 | 17:55 | 12 h 10 min | 64.1° |
| October | 06:00 | 11:42 | 17:24 | 11 h 24 min | 52.8° |
| November | 06:21 | 11:43 | 17:06 | 10 h 45 min | 43.6° |
| December | 06:41 | 11:55 | 17:10 | 10 h 28 min | 40.0° |
A year of daylight in Rājbirāj
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 Rājbirāj
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
25°collects the most energy over a year: 1452 kWh per kWp.
26°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 | January kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1339 | 92% | 2.55 | 1.9× |
| 15° | 1433 | 99% | 3.05 | 1.6× |
| 25° year-round best | 1452 | 100% | 3.28 | 1.5× |
| 26° off-grid best | 1452 | 100% | 3.30 | 1.5× |
| 27° = latitude | 1452 | 100% | 3.32 | 1.5× |
| 30° | 1449 | 100% | 3.37 | 1.5× |
| 45° | 1384 | 95% | 3.50 | 1.6× |
| 60° | 1245 | 86% | 3.43 | 1.9× |
| 70° | 1116 | 77% | 3.28 | 2.2× |
| 90° | 799 | 55% | 2.72 | 2.9× |
A fixed array in Rājbirāj produces the most over a year at 25°. The design month for an off-grid system is January: at 26° it makes 3.30 kWh per kWp a day, and costs 0% of the yearly total. Why steep panels win winter.
Off-grid solar in Rājbirāj at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 25° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 25° | Mean temp. |
|---|---|---|---|---|---|
| January | 3.13 | 3.83 | 3.28 | 3.28 | 14.5 °C |
| February | 4.27 | 4.52 | 3.81 | 4.19 | 18.2 °C |
| March | 5.46 | 4.63 | 3.82 | 4.85 | 23.5 °C |
| April | 6.07 | 3.81 | 3.08 | 4.82 | 28.0 °C |
| May | 5.93 | 3.00 | 2.39 | 4.37 | 29.6 °C |
| June | 5.20 | 2.56 | 2.02 | 3.75 | 29.8 °C |
| July | 4.53 | 2.42 | 1.92 | 3.34 | 27.5 °C |
| August | 4.81 | 2.90 | 2.33 | 3.70 | 27.0 °C |
| September | 4.46 | 3.32 | 2.70 | 3.70 | 25.8 °C |
| October | 4.48 | 4.40 | 3.63 | 4.20 | 23.4 °C |
| November | 3.92 | 4.97 | 4.17 | 4.15 | 19.6 °C |
| December | 3.13 | 4.24 | 3.61 | 3.44 | 15.7 °C |
| Year | 4.62 avg | 3.71 avg | 1116 kWh | 1452 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 610 Wp of panels at 70°, versus 360 Wp at 25°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Rājbirāj
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.
3.2 mrow pitch at 70°
2.9 mrow pitch at 25°
How Rājbirāj compares in Nepal
Against the other 45 places in Nepal with climate data, for a fixed array at its best angle.
37thof 46 places in Nepal for sunshine: 4.62 peak sun hours a day on flat ground.
−6%solar energy a year compared with the average place in Nepal: 1,452 against 1,548 kWh per kWp.
−5 mindaylight on the longest day, compared with Kathmandu: 13 h 48 min against 13 h 54 min.
25°best year-round tilt here; across Nepal it runs from 25° in Rājbirāj to 31° in Dipayal.
Of the 46 places in Nepal, Dārchulā gets the most sun (5.04 peak sun hours a day) and Ilām the least (4.33); Rājbirāj ranks 37th. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 1.92 kWh a day here, against 1.97 kWh on average in Nepal. The shortest day lasts 10 h 28 min, +5 min compared with Kathmandu.
Solar forecast for Rājbirāj, 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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Places near Rājbirāj
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A free, live card for Rājbirāj: 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.