Angular separation and planet-to-planet distance

Local calculations via astronomy-engine. Toggle topocentric angle, scan across time, plot the paths, and switch the time-axis display between observer timezone and UTC.

Date & time (local)

Use topocentric angle (location-dependent)

Use observer timezone for time charts

Show time arrows on angle-vs-distance plot

Color angle-vs-distance path by time

Angle uses geocentric or topocentric mode depending on the checkbox. Distance is heliocentric. Alt/Az readouts are topocentric.

Angular separation

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Planet-to-planet distance

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Mars (geocentric apparent)

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Venus (geocentric apparent)

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Observer settings

Location preset

Observer latitude (deg)

Observer longitude (deg)

Elevation (m)

Time zone (IANA)

Presets come from the shared ABHLSD location helper. “Use current location” asks the browser for device location; timezone falls back to the device timezone.

Scan and plot

Scan window (days, ± around selected time)

Step size (hours)

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Angular separation (deg) vs time

Distance (AU) vs time

Angle (deg) vs distance (AU)