Planetary Positions from AD 1000 to 3000: Range and Accuracy
Understand ClockAstronomical's AD 1000–3000 date range, its 1900–2100 accuracy target, UTC calendar rules, and sampled JPL verification.
Read the guideGuides and methodology
ClockAstronomical Blog
Practical guides to planetary positions by date, ephemerides, zodiac longitude, and motion—focused on how the application works, not predictions.
Start with the interactive planetary positions tool, or choose a guide below for a detailed workflow or explanation.
How to Find Planetary Positions by Date and Time
Learn how to calculate and read planetary positions for a chosen UTC date and time with ClockAstronomical's zodiac wheel and degree table.
Read the guideCurrent Planetary Positions: How to Read Today's Chart
Read ClockAstronomical's current planetary positions, zodiac signs, degrees, longitudes, and motion status without confusing them with sky visibility.
Read the guideHistorical and Future Planetary Positions
Explore historical and future planetary positions in ClockAstronomical with UTC examples, calendar guidance, and clear long-range accuracy limits.
Read the guideWhat Is a Planetary Ephemeris?
Learn how an ephemeris records planetary longitude, then read zodiac signs, degrees, and motion in ClockAstronomical.
Read the guideHow to Read ClockAstronomical's Interactive Zodiac Wheel
Read ClockAstronomical's zodiac wheel, planet markers, retrograde labels, filters, and forward or reverse time controls.
Read the guideRetrograde Planets by Date: How Motion Status Works
Learn how ClockAstronomical labels direct and retrograde motion for a chosen UTC date, including its numerical method, example, and limitations.
Read the guideTropical vs Sidereal Planetary Positions
Compare tropical and Lahiri sidereal zodiac positions, understand ayanamsa, and learn how ClockAstronomical switches between both systems.
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