Today's Solar Transit:
At Solar Noon, shadows are at their absolute shortest length for the entire 24-hour cycle and solar irradiance peaks.
Why Clock Noon Isn't Solar Noon
Most people assume 12:00 PM on a wall clock means the Sun is directly overhead. In reality, civil clock time is standardized across entire time zones spanning roughly 15 degrees of longitude, so Solar Noon — the exact moment the Sun crosses your local meridian and reaches its highest point for the day — almost never lines up with 12:00 PM exactly.
Three Reasons Solar Noon Drifts From Clock Noon
- Longitude within your time zone: the eastern edge of a time zone reaches Solar Noon earlier than the western edge, by up to roughly 30 minutes.
- The Equation of Time: Earth's elliptical orbit and axial tilt cause true solar days to vary slightly in length, shifting Solar Noon by up to about ±16 minutes across the year — the pattern traces a figure-eight called the analemma.
- Daylight Saving Time: shifting clocks forward an hour instantly moves Solar Noon from around 12:00 PM to around 1:00 PM civil time.
Solar Noon matters beyond curiosity: solar panel installers use it (not clock noon) to calculate optimal tilt, architects use it for passive-solar window placement, and photographers avoid it because midday shadows are the least flattering light of the day. For the full derivation and worked examples, read our Solar Noon & True Solar Time guide, or look up any city's exact transit time on our country pages.