Toolbar buttons

Print: Activates the print window for printing a star chart.
Constellation lines: Toggles constellation lines on and off.
Constellation boundaries: Toggles constellation boundaries on and off.
Constellation names: Toggles constellation names on and off.
Celestial grid: Toggles the celestial grid on and off.
Altitude/Azimuth grid: Toggles the altitude/azimuth grid on and off.
Ecliptic: Toggles the ecliptic (path followed by the sun) on and off.
Horizon: Toggles the horizon on and off.
Planets, Sun, Moon: Toggles the planets, sun, and moon on and off.
Deep sky objects: Toggles deep sky objects on and off.
Deep sky object names: Toggles deep sky object names on and off.
Milky Way: Toggles the Milky Way on and off.
Pause time: Pauses time, so that it does not progress.
Run time: Cancels pause, so that time can progress.
Add time: Adds the amount of time shown in the drop-down listbox (immediately to the right of the button) to the local date and time.
Subtract time: Subtracts the amount of time shown in the drop-down listbox (immediately to the left of the button) from the local date and time.
Computer time: Sets the local date and time that Night Vision uses to the computer's date and time. The on state (darkened button border) indicates the two are out of sync. (Note: To stay in sync, time must not be paused, and must be running at 1X speed.)
Zoom in: Magnify the view in the main window.
Zoom out: De-magnify the view in the main window.