Solar Spectrum: Rise, Set, and Space Weather
Sun Events Timetable
| Sunset/Sunrise | 17:31 | 04:42 | ||||||
| Civil Twighlight | 17:59 | 04:14 | ||||||
| Nautical Twighlight | 18:31 | 03:43 | ||||||
| Astronomical Night | 19:03 | 03:10 |
| Elevation at transit | 60° |
| Transit time | 11:07 |
| Distance to Earth | 1.0086 AU (150,884,412 km) |
Sun
Last update: Wed, 3 September 2025, 21:00
Current Sunspot and Flare Activity
The Sun currently displays 12 active sunspot regions visible from Earth, varying in size and magnetic complexity. No new regions detected in the past 24 hours.The largest sunspot is AR 4197, classified as Ekc, covering 700 millionths of the solar hemisphere (MSH), and containing 50 individual spots.
Today's flare activity includes:
- M1.5-class flare from AR 14203 at Thu, 28 August 2025 11:30
- M1.2-class flare from AR 14203 at Thu, 28 August 2025 08:00
- M1.0-class flare from AR 14203 at Thu, 28 August 2025 09:48
- M1.0-class flare from AR 14203 at Thu, 28 August 2025 19:09
Explore detailed sunspot data, including all active regions, classifications, and flare history
Real-Time Solar Imaging
The data used in these images are provided by the Solar Dynamics Observatory (SDO). The SDO is a mission of NASA’s Living With a Star (LWS) Program, designed to understand the causes of solar variability and its impacts on Earth. The Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) instruments onboard SDO deliver high-resolution, real-time images of the sun in multiple wavelengths, which are essential for studying solar phenomena and predicting space weather. We gratefully acknowledge the efforts of the entire SDO team and NASA for making these invaluable data available to the public.
Magnetogram
HMI (Helioseismic and Magnetic Imager) magnetogram photos depict the sun's magnetic field strength and direction on its surface. These images, taken by the HMI instrument on the Solar Dynamics Observatory (SDO) satellite, reveal the intricate magnetic structures, including sunspots and active regions.
Intensitygram
HMI intensitygram photos display the sun's surface in visible light, highlighting features such as sunspots, granulation, and solar faculae. These images, captured by the HMI instrument aboard the Solar Dynamics Observatory (SDO), provide a detailed view of the sun's photosphere, allowing for the observation of sunspot development and movement.
Solar Magnetism: Coronal Loop Dynamics
These photos capture the sun in the 171 angstrom wavelength, highlighting the solar corona and upper transition region. These images, taken by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO), reveal the structure of the sun's outer atmosphere and trace the magnetic field lines extending into space. The 171 Å wavelength is particularly effective at showing the million-degree plasma loops that emerge from the sun's surface.
Active Regions, Flares, and Coronal Holes
AIA 193 Å photos capture the sun in the 193 angstrom wavelength, focusing on both the hot corona and the cooler material of solar flares and coronal mass ejections (CMEs). These images reveal the sun's outer atmosphere and coronal holes, which are regions where the solar wind escapes into space. The 193 Å wavelength is particularly useful for observing the high-temperature plasma that forms in the corona, typically around 1.25 million Kelvin, and during solar flares, it can reach up to 20 million Kelvin.
Solar Passage Through Day
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Current Sun position
| Time | 21:09 |
| Latitude | 37.3541 |
| Longitude | -121.955 |
| Sun elevation | -38° |
| Sun Azimuth | 38° |
Yearly Sunlight Dynamics
Sun Properties
| Date | Thu, 4 September 2025 |
| Twiglight begin | 18:31 |
| Twiglight end | 03:43 |
| Astrosession duration | 9h 12m |
| Elevation at transit | 60° |
| Transit time | 11:07 |
| Distance to Earth | 1.0086 AU (150,884,412 km) |
| Equatorial coordinates at midnight | RA: 10h 53m 32s", Dec: 07° 04' 01s |
| Constellation | Leo |
Last and Upcoming Solar Eclipse
Sat, 29 March 2025
Partial Solar Eclipse
Global
93%
Local
-
| Global | From Your location | |
|---|---|---|
| Penumbra | 23:52-03:44 | Not Visible |
| Umbra | - | Not Visible |
Sun, 21 September 2025
Partial Solar Eclipse
Global
80%
Local
-
| Global | From Your location | |
|---|---|---|
| Penumbra | 08:31-12:55 | Not Visible |
| Umbra | - | Not Visible |
Last and Upcoming Lunar Eclipse
Fri, 14 March 2025
Total Lunar Eclipse
Global
100%
Local
100%
| Global | From Your location | ||
|---|---|---|---|
| Penumbral | 18:59-01:01 | 18:59-01:01 | |
| Partial | 20:10-23:50 | 20:10-23:49 | |
| Total | 21:27-22:33 | 21:27-22:33 |
Sun, 7 September 2025
Total Lunar Eclipse
Global
100%
Local
-
| Global | From Your location | ||
|---|---|---|---|
| Penumbral | 06:30-11:56 | Not Visible | |
| Partial | 07:28-10:59 | Not Visible | |
| Total | 08:32-09:54 | Not Visible |
Aurora Activity
North
South
KP-index: 1.33. Quiet geomagnetic conditions
Aurora Probabilty on Your Location: 0%
Astrometric & Physical Parameters of Sun
Coordinates & Visibility
| Right Ascension | 10.89223° |
| Declination | 7.06711° |
| Magnitude | -26.7 |
| Constellation | Leo |
| Elevation | -37.9° |
| Azimuth | 37.9° |
Basic Properties
| Mass, kg | 1.98841E+30 |
| Mean density, g/cm³ | 1.408 |
Rotation
| Sidereal rotation period, days | 25.38 d |
Surface & Atmosphere
| Surface gravity, m/s² | 274.0 m/s^2 |
| Escape velocity, km/s | 617.7 |
| Mean temperature, K | 5772 |
Data Acknowledgment
Our solar system data—including planetary physical and orbital parameters—comes from the Solar System OpenData API , maintained by Le Système Solaire. We thank Christophe and the contributors for making this open data available.