Muskegon Astronomical Society, JavaScripts

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

Note: All USNO forms should be working. If a USNO form doesn't work, however, let know (if the format of an input value changes, our form needs to be adjusted).

Descriptions

• Almanac (Sky and Telescope) interactive almanac. For more information, click here.
• Angular Separation computes the distance between two stars.
• Astro-Physical Calculator is basically the calculator on Chris Dolan's webpage with a couple more buttons added for high-energy astrophysicists. This particular version came (with permission) from the Dipankar Maitra.
• Astronomical Calendar (in-the-sky).
• 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.
• Comet This script uses dynamic html to display a single glowing star, orbiting the mouse cursor.
• Celestial Rise/Set Times (USNO) This form creates a rise/transit/set table for a specified celestial object. From the U.S. Naval Observatory, Astronomical Applications Department.
• 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.
• Daylight Savings Time (USNO) This utility displays start/end of daylight savings time for a given year. From the U.S. Naval Observatory, Astronomical Applications Department.
• Decimal Calculator is a simple on-line calculator to convert degrees (hours/minutes/seconds) to either decimal degrees or radians.
• Earth (John Walker) view of the Earth, 35785km above your location.
• Earth's Seasons - Equinoxes, Soltices (USNO) This form creates a table of Earth's seasons for a given year and time zone. From the U.S. Naval Observatory, Astronomical Applications
• Ephemeris planetary ephemeris offerings.
• Epoch Converter will let you convert RA/Dec coordinates from one epoch to another.
• Epoch Converter, Batch will let you convert a whole set of 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.
• Julian Date Converter Converts calendar date and time to Julian date, and vice versa.
• 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 Red Spot (Sky and Telescope) will display the great red spot transit times, for a given date.
• 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.
• Jupiter's Moons (in-the-sky)
• Jupiter's Moons Eclipses generates a table of Jupiter moon occultation and eclipses. Use the location code "H24" for the Veen Observatory. On the generate table, type "2E4" means Europa eclipses Callisto. E = Eclipse, O = Occults, 1 = Io, 2 = Europa, 3 = Ganymede, 4 = Callisto. You can also find monthly predictions in S&T, celestial calendar section.
• Length Calculator is a simple on-line calculator to convert feet to inches, meters, etc.
• Local Sidereal Time (USNO) displays the apparent local sidereal time (L.S.T.) from the U.S. Naval Observatory.
• 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.
• Meteor Shower gives the peak days of meteor showers, given the specified year.
• Meteor Showers and ZHL Computation Useful calculator by Paul Schlyter to measure the position and altitude of Perseid meteors. By entering the geographical position of both observers and the respective coordinates of an object in the sky, it will compute the position and altitude of the object. Can be used for Noctilucent clouds.
• 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 #4 Moon phase calculator, calculations from S&T article.
• Moon (John Walker)
• 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, Calendar Monthly Moon Phase Calendar by stardate.org.
• 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 Data (heavens-above.com) gives the moon's position for the current date/time. For more information, visit heavens-above.com.
• 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, 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.
• Moon, Phase (Brian Casey) produces an image of the moon for a given date.
• 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.
• Moon Rise/Set Times (in-the-sky)
• Moon Rise/Set Times (timeanddate.com)
• Neptune Moon, Triton Tracker (Sky and Telescope) JavaScript utility can help users of moderate to large telescopes find Neptune's largest satellite. For more information, click here.
• Planetary Positions gives the planet's position for the given date/time.
• Planetary Positions, Current gives the planet's current positions.
• Planetary Positions, Orrery gives the planet's position (RA/Dec & Sky Chart) for the given date/time.
• Planetary Positions, Orrery #2 same thing, bigger chart.
• Planetary Positions, Orrery (in-sky-sky)
• 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 Rise/Set Times (in-the-sky)
• 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/Decl <=> Alt/Az will convert Right Ascension/Declination coordinates to/from Azimuth/Altitude coordinates.  Displays Local Sideral Time.
• RA/Decl <=> Alt/Az from the Paul Schlyter web site.
• Ronchi Calculator (Mel Bartels) useful tool in mirror grinding, from Mel Bartels.
• 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.
• Sirius A & B Map showing the separation of Sirius B from the main star Sirius A. You can flip/rotate this map to orient it to your telescope.
• 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. For more information, click here.
• Solar Eclipse, April 8, 2024 Resources and interactive maps of April 8, 2024 Total Solar Eclipse.
• Solar Eclipse Computer (USNO) This form creates a table on the specified solar eclipse. From the U.S. Naval Observatory, Astronomical Applications Department.
• Solar System displays common solar system distance figures. A test for JavaScript code.
• Solar System (John Walker)
• Solar System, Scale Model helps you build a scale model. For example, with a foot wide model of the Sun, you'd have to make a one inch model of Saturn and place it 1025 feet away.
• Sun (heavens-above.com) gives the sun's position for the current date/time. For more information, visit heavens-above.com.
• 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 Rise/Set Times gives the sun rise/set times of the specified day.
• Sun Rise/Set Times (in-the-sky)
• Sun Rise/Set Times (timeanddate.com)
• Sun and Moon (Peter Hayes) a sun/moon ephemeris generator. For more information, email Peter Hayes.
• 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.
• Telescope Baffle Size (Mel Bartels) helps you determine the optimum baffle size for an open truss tube telescope, from Mel Bartels.
• Telescope Diagonal Size (Mel Bartels) helps you determine the optimum diagonal/secondary size for your telescope, from Mel Bartels.
• Telescope Optimizer (Mel Bartels) is a suite of tools to help you optimize a reflecting telescope, from Mel Bartels.
• Telescope Secondary Size, Strehl Ratio helps you determine the optimum secondary size for your telescope.
• 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.
• U.S. Time Clock (National Institute of Standards and Technology). For more information, click here.
• World Time Clock (timeanddate.com). Current times for cities around the world.
• Your Night Sky planetarium offerings.
• Your Satellite Sky satellite predictor offerings.

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

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This web page was last updated 03/29/23