Neptune Perigees and Apogees Calculator
For the 299-Year Span From 1801 AD to 2099 AD
Built Around the NASA/JPL Horizons API
PHP Program by Jay Tanner
Year
Time Zone
UTC
Optional Location Label
Double-Click Within Text Area to Select ALL Text
NEPTUNE PERIGEE AND APOGEE FOR THE YEAR 2024 ================================================ Time Zone UTC+00:00 Dates refer to the modern Gregorian calendar. ======================================================================== EVENT Julian Date UTC Calendar Date Time UTC Distance AU ------- ----------------- --------------- ----------- ---------------- Apogee 2460387.828510192 2024-Mar-18-Mon 07:53:03 AM 30.8968305964420 Perigee 2460573.670878841 2024-Sep-20-Fri 04:06:04 AM 28.8931170474145 ------- ----------------- --------------- ----------- ----------------
Double-Click Within Text Area to Select ALL Text
NOTES: [1] This Neptune perigee and apogee calculator spans the 299 year period from 1801 AD to 2099 AD. It was written in PHP v7.4.9 and makes internal calls to the NASA/JPL Horizons API v1.1 Julian Dates (JD) and Calendar Dates: JD < 2299160.5 = Refers to Old-Style Julian Calendar Dates JD >= 2299160.5 = Refers to Modern Gregorian Calendar Dates Given JD = General Julian Date, then the Julian Day Number on the Calendar is JD Number = floor(JD + 0.5) Dates up to 1582-Oct-04-Thu refer to the Julian calendar. Dates from 1582-Oct-15-Fri refer to the Gregorian calendar. Technically speaking, there are no calendar dates in the range from 1582-Oct-05-Fri to 1582-Oct-14-Sun because those 10 dates were dropped from the calendar during the Julian to Gregorian calendar transition to bring dates of the seasons back into alignment with the sun and the rule for leap year was changed to prevent the previous calendar error from recurring. The date following 1582-Oct-04-Thu was 1582-Oct-15-Fri, the official first date on our modern Gregorian calendar system. [2] Occasionally a time-out may occur if the JPL Horizons server is temporarily unavailable or too busy and an error occurs. If such a crash or hang-up does occur, simply refresh and try again. [3] UT1 = Old Universal Time Scale - Solar based. Old previous UT time scale used for years up to 1961. UTC = Coordinated Universal Time Scale - Atomic based. Newer UT time scale used from 1962 to date. World times are now based on this standard. LT = Local Time for the given time zone based on the given +/− HH:MM offset. Time Zone Offset Convention: West of Greenwich, time zone offsets are negative. East of Greenwich, time zone offsets are positive. [4] Standard times are assumed. To adjust for Daylight Saving or Summer Time, add 1 hour to the standard times taking care to watch for any change of date -OR- subtract 1 hour from the time zone offset, which will automatically handle any date change. For example, the time zone offset for Eastern Standard Time (EST) is normally -5 hours. However, when Eastern Daylight Time (EDT) is in effect, use a time zone offset of -4 hours instead. The computed times will be in EDT and automatically handle any date changes. [5] There is an optional location label that can be applied to the computed table for reference. However, any label should match the indicated time zone so as to be accurate and make sense. For example, if using the time zone offset for India, putting 'New York City, USA' as the location, would be rather absurd and an inaccurate match between location name and time zone. The label can consist of any printable plain-text string and defaults to 'Greenwich, England' at Time Zone Offset +00:00. [6] This program implements a cookie to store and recall the year and other interface settings between calls. It does not track, monitor or perform any other activity. If you navigate away and come back later, the interface settings stored in the cookie will be recalled from your last visit. Each call will refresh the cookie for up to 7 days retention unless deleted sooner. There is no harm in deleting the cookie. The program will simply revert to the original default values.
Download PHP 7 Source Code For This Program
Program by Jay Tanner
Revised: Friday - March 03, 2023 at 01:47:42 UTC - PHP v7.4.9