Central Bohemia · Czechia · 50.23° N · 14.09° E
Solar position in Slaný
Sun position, daylight and the best solar panel angle for Slaný — computed for 50.23° N, 14.09° E, 282 m above sea level.
The sun right now
Sun in Slaný today
Saturday, 24 October 2026 · local time UTC+2
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:51 | sun 18° below horizon |
| Nautical dawn | 06:29 | 12° below |
| Civil dawn | 07:06 | 6° below |
| Sunrise | 07:40 | 108° ESE |
| Golden hour ends | 08:26 | sun 6° up |
| Solar noon | 12:47 | 28.0° high |
| Golden hour starts | 17:08 | sun 6° up |
| Sunset | 17:54 | 252° WSW |
| Civil dusk | 18:27 | 6° below |
| Nautical dusk | 19:05 | 12° below |
| Astronomical dusk | 19:43 | 18° below |
| Day length | 10 h 14 min | |
Sun path diagram for Slaný
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 63.2° at solar noon in Slaný; on the December solstice only 16.4°. Sunrise swings from 50° NE in June to 127° SE in December — a 77° 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 | 07:51 | 12:15 | 16:38 | 8 h 47 min | 20.0° |
| February | 07:03 | 12:17 | 17:31 | 10 h 28 min | 29.3° |
| March | 06:04 | 12:11 | 18:18 | 12 h 13 min | 40.1° |
| April | 05:58 | 13:02 | 20:07 | 14 h 09 min | 51.7° |
| May | 05:09 | 13:00 | 20:52 | 15 h 43 min | 60.0° |
| June | 04:53 | 13:05 | 21:17 | 16 h 25 min | 63.2° |
| July | 05:17 | 13:10 | 21:02 | 15 h 45 min | 60.2° |
| August | 06:01 | 13:06 | 20:11 | 14 h 09 min | 51.8° |
| September | 06:48 | 12:56 | 19:04 | 12 h 16 min | 40.4° |
| October | 07:35 | 12:47 | 18:00 | 10 h 25 min | 29.0° |
| November | 07:26 | 11:49 | 16:11 | 8 h 45 min | 19.8° |
| December | 08:00 | 12:01 | 16:02 | 8 h 02 min | 16.4° |
A year of daylight in Slaný
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 Slaný
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
38°collects the most energy over a year: 1086 kWh per kWp.
73°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 | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 897 | 83% | 0.50 | 8.8× |
| 15° | 1015 | 93% | 0.76 | 6.0× |
| 30° | 1077 | 99% | 0.99 | 4.5× |
| 38° year-round best | 1086 | 100% | 1.09 | 4.0× |
| 45° | 1080 | 99% | 1.16 | 3.6× |
| 50° = latitude | 1068 | 98% | 1.20 | 3.3× |
| 60° | 1025 | 94% | 1.26 | 3.0× |
| 70° | 957 | 88% | 1.29 | 2.7× |
| 73° off-grid best | 933 | 86% | 1.29 | 2.6× |
| 90° | 759 | 70% | 1.24 | 2.1× |
A fixed array in Slaný produces the most over a year at 38°. The design month for an off-grid system is December: at 73° it makes 1.29 kWh per kWp a day, 19% more than at 38°, and costs 14% of the yearly total. Why steep panels win winter.
Off-grid solar in Slaný at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 38° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 38° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 0.84 | 1.78 | 1.60 | 1.35 | -2.5 °C |
| February snow | 1.62 | 2.64 | 2.38 | 2.21 | -1.2 °C |
| March | 2.70 | 3.34 | 2.97 | 3.12 | 2.8 °C |
| April | 4.17 | 3.98 | 3.47 | 4.09 | 8.3 °C |
| May | 4.95 | 3.82 | 3.26 | 4.24 | 13.0 °C |
| June | 5.37 | 3.76 | 3.15 | 4.30 | 17.2 °C |
| July | 5.20 | 3.78 | 3.15 | 4.21 | 19.4 °C |
| August | 4.46 | 3.85 | 3.22 | 3.97 | 18.9 °C |
| September | 3.23 | 3.63 | 3.10 | 3.39 | 13.9 °C |
| October | 1.91 | 2.79 | 2.43 | 2.39 | 8.4 °C |
| November | 0.92 | 1.66 | 1.46 | 1.32 | 3.3 °C |
| December snow | 0.65 | 1.45 | 1.29 | 1.09 | -0.9 °C |
| Year | 3.01 avg | 3.04 avg | 957 kWh | 1086 kWh |
Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 910 Wp of panels at 70°, versus 1,090 Wp at 38°. The steep array is 16% smaller for the same winter. Size your own system.
Row spacing in Slaný
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.
8.7 mrow pitch at 70°
6.8 mrow pitch at 38°
How Slaný compares in Czechia
Against the other 95 places in Czechia with climate data, for a fixed array at its best angle.
71stof 96 places in Czechia for sunshine, shared: 3.01 peak sun hours a day on flat ground.
−2%solar energy a year compared with the average place in Czechia: 1,086 against 1,107 kWh per kWp.
+1 mindaylight on the longest day, compared with Prague: 16 h 25 min against 16 h 23 min.
38°best year-round tilt here; across Czechia it runs from 38° in Prague to 39° in Ostrava.
Of the 96 places in Czechia, Břeclav gets the most sun (3.25 peak sun hours a day) and Děčín and 10 other places the least (2.96); Slaný ranks joint 71st. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.29 kWh a day here, against 1.35 kWh on average in Czechia. The shortest day lasts 8 h 02 min, −1 min compared with Prague.
Solar forecast for Slaný, 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 Slaný
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A free, live card for Slaný: 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.