NOTE: The various windows in this application can be moved around the screen by clicking on the window title and dragging the window to the desired position on screen.

LunarPhase Pro does not use the conventional Windows' look and feel. Instead, a unique (and hopefully pleasing) user interface has been designed for the application. The minimum resolution required for LunarPhase Pro is 800x600.

Across the top is the screen is the menu bar offering icons for printing, changing optical view, calling up the Ephemeris screen, activating web links, changing the time, accessing other inbuilt features, calling up the Lunar Explorer screen, viewing eclipse details, calling up the Configuration screen, Help, About, Minimise and Exit functions.

Below this are two clocks and two windows the Current Phase and Major Phases Windows.

The clock, which increments in realtime (i.e. it's updated every second), displays the time for which the calculations are done (in realtime). That time can be Now (as set from your PC's clock) or any time you wish. This, in conjunction with the calendar, lets you get the lunar circumstances for any date and time. See Selecting a Different Time on how to change the time.

Sidereal time is the hour angle of the vernal equinox, the ascending node of the ecliptic on the celestial equator. The daily motion of this point provides a measure of the rotation of the Earth with respect to the stars, rather than the Sun. Local mean sidereal time is computed from the current Greenwich Mean Sidereal Time plus a sidereal offset in longitude (the longitude you specify on the Configuration Screen). Astronomers use local sidereal time (LST) because it corresponds to the right ascension of a celestial body that is presently on the local meridian.

LunarPhase Pro's Local Sidereal Clock always displays the LST of the current date and time (read directly from the PC's clock) and is not affected by your selection of date or time within LunarPhase Pro itself.