Grids & Reference Help

The settings in this view let you show or hide grids which display the major celestial coordinate systems, as well as the reference lines and points that those systems are based on.

Celestial Coordinate Grid

• Show Grid: Displays a celestial coordinate grid on the sky chart.
• with Horizon Coordinates: Displays an alt-azimuth coordinate grid.
• with Equatorial Coordinates: Displays a right ascension/declination grid.
• with Ecliptic Coordinates: Displays an ecliptic longitude/latitude grid. (Pro only)
• with Galactic Coordinates: Displays a galactic longitude/latitude grid. (Pro only)

Reference Lines

• Celestial Equator: The plane of the Earth's equator projected onto the celestial sphere.
• Galactic Equator: The plane of the Milky Way galaxy projected onto the celestial sphere.
• Ecliptic Path: The plane of the Earth's orbit projected onto the sky.
• Meridian Line: The projection of your longitude onto the celestial sphere.

Reference Points

• Celestial Poles: Where the Earth's polar axis intersects the celestial sphere.
• Galactic Poles: Where a line perpendicular to the Milky Way plane intersects the celestial sphere.
• Ecliptic Poles: Where a line perpendicular to the Ecliptic intersects the celestial sphere.
• Zenith & Nadir: Points directly overhead and underneath your feet.
• Equinox Markers: Markers for the Vernal and Autumnal Equinoxes.
• Solstice Markers: Markers for the Summer and Winter Solstices.