Select a day, then look under Astronomical Events in the inspector’s Day tab. Chronologia lists events whose calculated instant falls on that day.

Astronomical events are displayed automatically; event-pack settings do not affect them.

Seasons and Moon phases

Chronologia can show:

• March and September equinoxes
• June and December solstices
• New Moon
• First Quarter Moon
• Full Moon
• Last Quarter Moon

The time beside these events is labeled TDB: Barycentric Dynamical Time. It is an astronomical time scale, not your local civil time.

Solar eclipses

Solar eclipses are identified as total, annular, hybrid, or partial. The inspector shows:

• The time of greatest eclipse, labeled TD
• Eclipse magnitude to four decimal places
• The Saros series number
• The source acknowledgement

TD is dynamical time rather than local clock time. Solar-eclipse predictions are credited in the app to Fred Espenak, NASA/GSFC.

Show the eclipse path

For a total, annular, or hybrid eclipse, select the map button at the right side of the event. You can also double-click the event row.

The map displays:

• The central line in red
• The northern and southern limits of the central eclipse path in blue
• The location of greatest eclipse with a purple marker
• Compass, map scale, and zoom controls

The path is the central path of totality or annularity. Partial solar eclipses do not have such a path, so Chronologia does not offer the map button for them.

Lunar eclipses

Lunar eclipses are identified as total, partial, or penumbral. The inspector shows:

• The time of greatest eclipse, labeled TD
• Penumbral magnitude
• Umbral magnitude
• The Saros series number
• The source acknowledgement

Lunar-eclipse predictions are credited in the app to Fred Espenak and Jean Meeus, NASA/GSFC. Chronologia does not currently provide a map for lunar eclipses.