alcyone software Apps
Planetary Visibility 1.0.1
PLSV (Planetary, Lunar and Solar Visibility)isan astronomy app for sophisticated star enthusiasts andhobbyastronomers who value well-founded and preciseastronomicalillustrations and data.It presents a 3-color diagram that shows when a planet, themoonor the sun is visible during any year from 1900 to 2100 atanylocation on the earth. The vertical axis marks the months oftheyear, the horizontal axis marks the hours of the day. Thethreecolors create a contour map effect and show whether the bodyisunder the horizon (black) and invisible, above the horizon withthesun (light color) and invisible, above the horizon without thesun(shaded color) and so possibly visible. The times of sunriseandsunset or when the sun reaches specified altitudes belowthehorizon (-6°/-12°/-18° for civil, nautical orastronomicaltwilight) can be shown as curves on the diagrams. Bymoving acursor over the diagram, the date and time along with theobject'saltitude, azimuth, apparent size and magnitude, or thephase of themoon, are displayed. The times of specific astronomicalevents(e.g. oppositions, greatest elongations, begin and endofretrograde motion, equinoxes, solstices, solar and lunareclipses)can also be marked in the diagram.In addition, Planetary, Lunar, and Solar Visibility computesandtabulates the dates of these astronomical events withadditionalinformation. Also tables of rising, setting andculmination timesof the planets, the moon or the sun can becomputed.
