 Nine main astronomical programs included in a directory to calculate SEASON begin (exact or fast), deltaT (TT-UT), —>WK.D (week day), JD—> (date to Julian Day), JD—> (reverse), —>epsilon (Earth axial tilt), —>TROPIC.YR —>SID(Sidereal Time), with great precision according to Astronomical Algorithms, 2nd edition, by Jean Meeus. The program calculates automatically also: M (µ Anomaly of the Sun), M´ (µ Anomaly of the Moo), F (µArg LatMoon), D (µElong Moon from Sun), deta¥ (Nutation in longit longitude), deltaEpsilon (Nutation in obliquity), Oméga (µLongAscendNode Moon). It also includes the equation of time according to abridged version VSOP1987, together with alpha Sun's Ascension and delta Sun's Declination, both with errors less than a fraction of a second. It calculates also: L0 (Sun geometric mean longitude), C (Sun equation Centre), O/ß (Sun true geocentric longitude/latitude), Lamda (Sun apparent Longitude), nu (Sun true anomaly) and R (distance Sun centre to Earth centre). There are also two small conversion programs to calculate T->Date (T in hundred of centuries after 2000 back to the original date and hour) and —>Teph (Terrestrial time to Ephemerid time). |
Generates sky charts, text lists, and predictions of satellites, sun, moon, planets and stars. Now parses current Celestrak files, with the indicators [-], [+], and [P] in the satellite names. Designed for the 49g+ and 50g. Now stores satellite preferences on the SD card, so you can keep different constellations on different SD cards. This old version is maintained because it also works on the 49g+.
Generates sky charts, text lists, and predictions of satellites, sun, moon, planets and stars. Now parses current Celestrak files, with the indicators [-], [+], and [P] in the satellite names. Designed for the 50g. Now stores satellite preferences on the SD card, so you can keep different constellations on different SD cards. Version 2.0 uses the serial port of the 50g to communicate with a GPS receiver in NMEA mode or with a Kenwood TH-D7A(G) (or equivalent) Data Radio. New features include extracting time and position data from a GPS receiver, and triggering beacon transmissions from the Data Radio to coincide with satellite availability.
ALBW = Allocated Bandwidth. This is a program for satellite communication engineers and planners. It determines the amount of bandwidth required to accommodate a carrier signal on a satellite transponder, given the data rate, coding, and modulation methods. Version 1.1 incorporates occupied bandwidth.
A collection of astronomy and calendar functions: position, rise, culmination and set time and location for sun, moon and planets, moon phases, calendar, holy days, Julian day, coordinate and time conversions, general rise and set time, daylight saving time switch, great circle distance, compass function.
Position of the Sun, Moon, 9 major planets+xena. Theories VSOP87B + TOP2010A + corrections from DE422. Date of Easter. Positions of the main satellites of Jupiter, Saturn, Uranus. Comets: Parabolic-Hyperbolic-Elliptic motion. Precession formulae valid +/-200,000 years from J2000. Phases of the Moon.
Provides functions for setting the local time variable, the Dead Reckoning position, Long and Lat and, from these variables, computing the positions, magnitudes, and phases of the stars, planets and moon, and more. Requires 
Allows anyone with a telescope equipped with an equatorial mount and setting circles to point and view without any polar alignment. The need for polar alignment is eliminated by a unique system which relies on 2 guide stars.
Computes ephemeris of the sun, planets, the moon, stars, Messier objects, comets, and asteroids. Program allows all kind of coordinates, and also gives distance, magnitude, apparent diameter, phase and rising/transit/setting times. Includes version 2.13 for the 49G/49G+/50G, 1.33 for the 48S/SX and 48G/G+/GX, and full PDF documentation.
Modified version of EPHE, written by Jean Philippe Eimer. Most routines have been converted to System RPL, hence a faster program. This version only works with the HP 49G/g+.
This program will replace all six volumes of the Sight Reduction Tables for Marine Navigation. Since the data in the tables is purely mathematical they never go out of date. The tables are used by knowing LHA, Latitude and Declination and they return HC and Z. Version 2.0 has been rewritten in System RPL for much better performance and a slightly better interface.
This program show the sun's track and allows you to find north.
HPlanetarium is a free (GPL) planetarium for the HP 39/40/48G/49/50 in which you can move, zoom and unzoom the sky map "in real time". Equatorial/azimutal coordinates, rise/transit/set times, elongation, magnitude and diameter can be computed for main planets. You can also point a Meade telescope, and there is an ephemeris generator. Source code for the HP 49 is provided. A light version (only 24 KB) is available for the HP 48G.
JMOON2 allows you to view present, past and future positions of Jupiter's most commonly known moons (Callisto, Europa, Io, Ganymede).
Moon is a small program to calculate and display the moon phases. It uses the drawing routines provided by Craig Finseth's phase of the moon program (with the modifications to FLIP as suggested by Preston Brown and Juri Munkki), but has an adapted version of the very complicated phase calculation in John Walker's moontool application on the SUN.
Astronomy program with around 130 tools. Requires (and includes) 
This is another modified version of the 
A convenient overview of the latest physical and geometrical data of our planetary system in a two-page menu. Updated according to the latest data (November 2001).
Provides satellite communications link budgeting, antenna siting, and sun interference calculations for geosynchronous satellites. Generates horizon profile drawings and predicted spectrum analyzer traces. Calculates antenna parameters, and bandwidth allocations. Provides for direct conversion and calculation of decibels and carrier to noise ratios. Compatible with 48GX, 48G+, 49G, 49g+, 48gII, and 50g.
A program to determine the transmit gain, receive gain, and figure of merit (G/T) of a parabolic satellite communications antenna. It uses antenna diameter, efficiency, transmit frequency, receive frequency, and receive system noise temperature as inputs. Although developed for satellite communications, it should work with any parabolic antenna system.
Light version of SATCO, a geosynchronous orbit satellite communications calculator. It provides basic information to help with antenna siting and alignment. It also predicts solar conjunctions (sun interference). Version 1.3 includes satellite and city databases.
This is the Sparcom Celestial Navigation Pac based on the celnav.lib by the original author. The package contains a dump of the original card for use in HP 48 emulators or on a memory card, the port of the software to the 49/50 as a library, and the scanned manual as a PDF. The dump is compatible with the 48SX/48GX; the library is compatible with the 49g+/50g. Redistributed with the permission of the family of Dr. Thomas Metcalf.
This is a modified version of the 
Gives a feel for what the sky will look like tonight, next week, last year, or whatever, for beginning astronomers. Includes over 650 stars from all 88 constellations, plus the highly accurate mean positions of the sun, moon, and all 9 planets. It also has zoom features for viewing smaller areas of the sky, solar eclipses, etc, and can correct for light time and parallax.
Computes sunrise, sunset, and meridian.
Sun and moon program. For the sun, calculates sunrise and sunset, coordinates, and sun compass. For the moon, calculates culmination coordinates, phase, and distance to the earth. System RPL and User RPL versions included.
RPL programs to calculate sunrise, solar noon and sunset times based on date, latitude, longitude, elevation and timezone.
Provides satellite antenna pointing angles with 3 decimal point accuracy. Allows accurate calibration of antenna tracking systems. Based on Intelsat Earth Station Standard (IESS) 412.
The Astronomical Companion: an almost complete and expandable implementation of the book "Astronomical Algorithms" written by the well-respected expert Jean Meeus. It is intended mainly for observation preparation and field use, but also for historical research. Now the full version is available for free.
This program calculates the probability of dividing ceramic by the Weibull model.
Extended Time, Date, Calendar and Astronomical routines for the HP 48G(X) and 49G(+). Part of these routines are ported from the invaluable HP-41C CALENDARS Users' Library Solutions. The astronomical routines include calculation of times of sunrise, transit and sunset, moon phases, and seasons.
Calendar time and astronomical routines for the HP 49G(+). Part of these routines are ported from the invaluable HP-41C CALENDARS Users' Library Solutions. The astronomical routines include calculation of times of sunrise, transit and sunset, moon phases, and seasons. Version 2 is more user friendly than version 1.1 in that INFORM and INPUT forms and a CHOOSE box have been written for the most important conversions. In version 2.1 user input is further improved. The separate subroutines have been maintained for those who want to use them for their own calculations.