Keywords: Planets position; Solar and Lunar
eclipses (1900-2100 and 1999-2030); Conjunctions and oppositions; Compass;
Clocks; Moon phases; Rise, transit and set; Epoch:1600-3000; 88 stars.
The program Planet 2000 allows to calculate the position of the solar
system bodies, from Mercury up to Saturn. It also calculates the Sun
and the Moon position. The program gives the celestial coordinates
(Right ascension and Declination) and the coordinates of the celestial
body respect on the observer (topocentric coordinates Azimuth and
Moreover it gives the time of the rise, set and transit. For the
planet it also gives the distance from the Sun; for the Moon the distance
from the Earth and its phases.
The program displays the heavenly vault; the celestial objects are
displayed using two systems:
1) altazimuth system coordinates: the abscissa and the ordinate indicating
the azimuth (angle from the Northern point of the horizon eastward) and
the altitude of the object from the observer's horizon, respectively;
2) spherical zenithal system: the center of the circle is the observer’s
zenith; circumference is the observer’s horizon.
It is possible to display stars all in one go. The user can tap on star to
obtain its name and its constellation.
It is possible to use the Palm like a real Compass. Put yourself in
front to any celestial object: the program calculates its position and
then it will display a Compass. You will be able to find any correct
geographical direction: North, East, South, West.
Also it is possible to obtain the dates of the Equinoxes and Solstices
for any year from 1000 up to 3000 (see the role of the Precession of the
equinoxes!) and the conjunctions and oppositions, respect to Sun,
of the planets from Mercury to Saturn.
Total-annular solar eclipses processed by the program are comprised
between 1900 and 2100 (exactly 287 eclipses from May 28th, 1900 to
September 4th, 2100).
The program also allows to observe Partial Solar Eclipses that will
happen from 2000 up to 2019.
The program generates animation of each total and partial solar eclipse:
the user can change geographical coordinates and observe it (if possible)
from any site.
Function Astro Clocks allows to display 3 clocks: Local Time,
Universal Time (time on Greenwich meridian), Sidereal Time (Right
Ascension that transits across observer’s celestial meridian). It is
possible to choose starting date and starting time. The three times will
be updated every second.
It displays Equation of Time for any date. When the Sun crosses the
meridian of the Time Zone it is solar noon there. But for our clock noon
can fall before or after the Sun transit.
The Earth’s Surface function allows to calculate the distance
between two points on the Earth’s surface. Moreover the program allows
to know a lot of other geographical information about the parallel of any
The program gives information about all Lunar eclipses from 1999 up
to 2030. For each eclipse we have: type of eclipse, date and instants,
magnitude, zenith coordinates, graphical representation.
The program allows to use the Palm like a real Compass.
Put yourself in front to any celestial object of solar system (Sun,
Moon, Mercury, Venus, Mars, Jupiter, Saturn) or 28 bright stars
(Sirius, Vega and so on): the program calculates its position on heavenly
vault and then it will display a Compass. You will be able to find any
correct geographical direction: North, East, South, West.
Moreover the program gives:
a) topocentric coordinates (Azimuth and Altitude);
b)equatorial coordinates (Right Ascension and Declination);
c) times of rise, transit and set of the celestial object (for the
Moon, when the event occur the next day, it will be displayed “****”).
Near the object name you can see the Azimuth and Altitude values (or Right
Ascension and Declination). On the right the program shows the altitude of
the object respect on the horizon and Local Sidereal Time.
It is possible to store geographical coordinates. Also it is
possible to obtain the dates of the Equinoxes and Solstices for any
year from 1000 up to 3000 (see the role of the Precession of the equinoxes!)
Earth’s Surface function
It is possible to calculate the distance between two points on the
Earth’s surface. Moreover the program allows to know other geographical
information about the parallel of any latitude: distance from Earth’s
center, the radius of the parallel, the length of one degree of longitude
and latitude, the linear velocity, the radius of curvature of the Earth’s
meridian at any latitude.