Sheets

JavaScript Spread Sheets

* JavaScript sheet uses latitude, longitude, time zone, and other parameters from the customized call to this web site (see [Configure Web Site] link).

JavaScript Sheet Descriptions

Allen Observatory Predictor This sheet computes the probability that Dennis Allen will be at his observatory tonight.
Almanac (Brian Casey & John Thorstensen) generates a daily almanac table.
Almanac (Sky and Telescope) interactive almanac. For more information, click here.
Angular Separation computes the distance between two stars.
Astronomical Calculator (Walter MacDonald) displays moon phases and lunar/solar eclipses. For more information, click here. Click here for email.
Astronomical Calendar (Brian Casey & John Thorstensen) allows you to generate html calendars of sun/moon rise/set times.
Astronomical Calendar (Wise Observatory) allows you to generate html calendars of sun/moon rise/set times.
Burnham Calculator will convert Right Ascension/Declination coordinates from Burnham's handbook to current epochs. For information on Robert Burnham Jr., click here.
Calculator is a simple on-line calculator.
Calendar Converter (John Walker) allows you to convert dates in a variety of calendars, both civil and computer-related.
Celestial Navigation Data (USNO) displays position from observations of the altitudes of celestial bodies from the U.S. Naval Observatory, Astronomical Applications Department.
Comet This script uses dynamic html to display a single glowing star, orbiting the mouse cursor.
Decimal Calculator is a simple on-line calculator to convert degrees (hours/minutes/seconds) to either decimal degrees or radians.
Ephemeris (ephemeris.com) an ephemeris generator. For more information, see the ephemeris.com site.
Ephemeris (Peter Hayes) a sun/moon/planet/separator ephemeris generator. For more information, see the Peter Hayes ephemeris site.
Ephemeris (Planets Summary by heavens-above.com) gives the planet's position for the current date/time. For more information, visit heavens-above.com.
Ephemeris (JPL HORIZONS) a third planetary ephemeris generator. To use this sheet, select your target body and generate your table. For more information, see Solar System Dynamics Group, Horizons On-Line Ephemeris System.
Ephemeris (USNO) This form lets you generate a rise, set, and transit table for a given celestial object. From the U.S. Naval Observatory, Astronomical Applications Department.
Ephemeris (Solar System Live by John Walker) another planetary ephemeris generator. For more information, see John Walker's Solar System Live site.
Ephemeris (Planetary Positions by Brian Casey) Generates an ephemeris information sheet for the current date/time.
Epoch Converter will let you convert RA/Dec coordinates from one epoch to another.
Equinoxes and Solstices Adapted from Meeus Astronmical Algorithms.
Eyepiece Magnification gives you the magnification of the most popular eyepiece sizes for your telescope.
Facility Predictor This sheet computes the probability that members will be at our observatory/facility tonight.
Julian Date Converter (USNO) This utility converts from calendar date and time to Julian date, and vice versa. From the U.S. Naval Observatory, Astronomical Applications Department.
Jupiter's Moons (Sky and Telescope) will open in a new browser window, you can tell at a glance the positions of Io, Europa, Ganymede, and Callisto at any particular date and time. For more information, click here.
Length Calculator is a simple on-line calculator to convert feet to inches, meters, etc.
Local Sideral Time (USNO) displays the apparent local sideral time (L.S.T.) from the U.S. Naval Observatory, Time Service Department.
Lunar Data (heavens-above.com) gives the moon's position for the current date/time. For more information, visit heavens-above.com.
Lunar Perigee and Apogee Calculator (John Walker) Displays the date, time, and distance of lunar perigees and apogees for a given year. For more information, see John Walker's home site.
Mars Profiler (Sky and Telescope) will open in a new browser window, you can tell at a glance which side of the red planet is facing Earth at any particular date and time. For more information, click here.
Martian Moons 2007 & 2008 (Sky and Telescope) JavaScript utility will open in a new browser window, tells you the positions of Phobos and Deimos for any date and time between December 2007 and January 2008. For more information, click here.
Meteor Shower gives the peak days of meteor showers, given the specified year.
Minima of Algol (Sky and Telescope) Calculates the dates and times when the eclipsing variable star Algol should be at its dimmest.
Moon This sheet pulls together all the information on this web site about the moon, including rise/set times, phase, # days until next quarter, etc. for any specified day This sheets uses Paul Schlyter algorithms to calculate the longitude of the moon and S&T algorithms to calculate accurate rise/set times.
Moon #2 This sheet pulls together all the information on this web site about the moon. Like the last sheet, it uses Paul Schlyter algorithms, just not the S&T code to calculate rise/set times.
Moon, Calendar Monthly Moon Phase Calendar by stardate.org.
Moon, Current Phase This sheet uses a JavaScript snippet to display the current phase of the moon.
Moon Altitude/Azimuth (USNO) This form creates a table of moon locations for one day. From the U.S. Naval Observatory, Astronomical Applications Department.
Moon, Fraction Illuminated (USNO) This hyperlink provides a way for you to obtain a table giving, for every day in a year, the fraction of the Moon's visible disk illuminated by the Sun. From the U.S. Naval Observatory, Astronomical Applications Department.
Moon, Lunar Eclipse Computer (USNO) With this form, you can obtain the circumstances of recent and upcoming lunar eclipse. From the U.S. Naval Observatory, Astronomical Applications Department.
Moon, Phases (Sky and Telescope) will show exact moon phases for any given date. For more information, click here.
Moon, Phases (USNO) This hyperlink displays the dates of moon phases for the 12 months of the current year. For more information about the phases of the moon from the U.S. Naval Observatory, click here.
Moon, Rotating Phases simply displays all available moon images on our web site.
Moon Rise/Set Times gives the moon rise/set times of the specified day.
Our Solar System displays common solar system distance figures. A test for JavaScript code.
Planetary Positions gives the planet's position for the given date/time.
Planetary Positions (Brian Casey & John Thorstensen) gives the planet's position for the given date/time.
Planetary Positions, Current gives the planet's current positions.
Planetary Positions, Sky Chart gives the planet's position (RA/Dec & Sky Chart) for the given date/time.
Planetary Rise/Set Times gives the planet's rise/transit/set times for the given date/time.
Planetary Rise/Set Times #2 gives the planet's rise/transit/set times for the given date/time. Results can be copied into clipboard.
Planetary, User Defined Object allows you to add orbital elements of a comet or asteroid. This object will then be displayed in either the "planet positions", "planet positions, current" or "planet rise/set times" JavaScript sheets.
RA/Dec <=> Al/Az will convert Right Ascension/Declination coordinates to/from Azimuth/Altitude coordinates. Displays Local Sideral Time.
Saturn's Moons (Sky and Telescope) will open in a new browser window, you can tell at a glance the positions of Titan, Rhea, Dione, Tethys, and Enceladus at any particular date and time. For more information, click here.
SkyView is a Virtual Observatory (NASA) on the Net generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray. This sheet offers both the basic and advanced forms. For more information, click here.
Solar System Simulator (NASA) on the Net generating images of an object from another object.
Strehl Ratio will help you determine the optimum diagonal size for your telescope.
Sun Altitude/Azimuth (USNO) This form creates a table of sun locations for one day. From the U.S. Naval Observatory, Astronomical Applications Department.
Sun (heavens-above.com) gives the sun's position for the current date/time. For more information, visit heavens-above.com.
Sun Rise/Set Times gives the sun rise/set times of the specified day.
Sun and Moon (Peter Hayes) a sun/moon ephemeris generator. For more information, see the Peter Hayes ephemeris site.
Sun and Moon, one day (USNO) displays complete sun and moon data for one day from the U.S. Naval Observatory, Astronomical Applications Department.
Sun and Moon, one year (USNO) displays complete sun/moon rise/set data for one year from the U.S. Naval Observatory, Astronomical Applications Department.
Trapezium Map of the lettered stars of the Trapezium, the light source for the Great Orion Nebula (Messier 42). You can flip/rotate this map to orient it to your telescope.
Uranus Moons (Sky and Telescope) will open in a new browser window, you can tell at a glance the positions of the five brightest Uranus moons at any particular date and time. For more information, click here.
Your Night Sky planetarium offerings. This is a complete list of "Your Night Sky" choices found in the observing links section.

Note: Many formulas had to be converted through two different programming languages. If you find any formula errors, please send an e-mail.

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This web page was last updated 04/07/09