TEST/DEMO FUNCTION: Loc_Sid_Time()
RawEphem = Loc_Sid_Time (TimeScale,StartDateTime,StopDateTime,StepSize,
TimeZone,DaySumYN,LonDeg,DEGorHMS)
This function returns a local sidereal time table ephemeris for a single date
and time or for a range of times at any given convenient intervals.
For Greenwich sidereal time, set:
TimeZone = '+00:00' and LonDeg = 0 and DaySumYN = 'No'
REFRESH page for a new random date/time span selection.
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Time Scale = UT
Time Zone = UT-01:00
Day/Sum Time ? = No
DEG or HMS ? = HMS
Reference Frame = ICRF
Start Date/Time = AD 1904-Dec-09 00:00:00
Stop Date/Time = AD 1904-Dec-17 00:00:00
Step Size = 1 day
Longitude = -76.862737 ° (+Positive = East)
Latitude = Not needed or used for these computations.
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API VERSION: 1.2
API SOURCE: NASA/JPL Horizons API
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Ephemeris / API_USER Sat Apr 26 13:27:26 2025 Pasadena, USA / Horizons
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Target body name: Sun (10) {source: DE441}
Center body name: Earth (399) {source: DE441}
Center-site name: (user defined site below)
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Start time : A.D. 1904-Dec-09 00:00:00.0000 UT-01:00
Stop time : A.D. 1904-Dec-17 00:00:00.0000 UT-01:00
Step-size : 1440 minutes
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Target pole/equ : IAU_SUN {East-longitude positive}
Target radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c}
Center geodetic : 283.137263, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 283.137263, 6378.137, 0.0 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : ITRF93 {East-longitude positive}
Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c}
Target primary : Sun
Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441}
Rel. light bend : Sun {source: DE441}
Rel. lght bnd GM: 1.3271E+11 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : HMS
Time format : CAL
Calendar mode : Gregorian
Time zone : UT-01:00
EOP file : eop.250425.p250722
EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-APR-25. PREDICTS-> 2025-JUL-21
Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
Table cut-offs 3: RA/DEC angular rate ( 0.0=NO )
Table format : Comma Separated Values (spreadsheet)
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Date_(ZONE)_HR:MN:SS, , , L_Ap_Sid_Time
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$$SOE
1904-Dec-09 00:00:00, , , 01 01 55.8924
1904-Dec-10 00:00:00, ,m, 01 05 52.4540
1904-Dec-11 00:00:00, ,m, 01 09 49.0138
1904-Dec-12 00:00:00, ,m, 01 13 45.5714
1904-Dec-13 00:00:00, ,m, 01 17 42.1269
1904-Dec-14 00:00:00, ,m, 01 21 38.6807
1904-Dec-15 00:00:00, ,m, 01 25 35.2334
1904-Dec-16 00:00:00, ,m, 01 29 31.7855
1904-Dec-17 00:00:00, ,m, 01 33 28.3379
$$EOE
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Column meaning:
TIME
Times PRIOR to 1962 are UT1, a mean-solar time closely related to the
prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current
civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1
using integer leap-seconds for 1972 and later years.
Conversion from the internal Barycentric Dynamical Time (TDB) of solar
system dynamics to the non-uniform civil UT time-scale requested for output
has not been determined for UTC times after the next July or January 1st.
Therefore, the last known leap-second is used as a constant over future
intervals.
Time tags refer to the UT time-scale conversion from TDB on Earth
regardless of observer location within the solar system, although clock
rates may differ due to the local gravity field and no analog to "UT"
may be defined for that location.
Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank
(" ") denotes an A.D. date.
CALENDAR SYSTEM
Calendar dates are given in the modern Gregorian system, extended prior to
its 1582-Oct-15 adoption. The Gregorian calendar more closely corresponds to
physical Earth seasons and orbital motion, but can differ by up to 10 days with
historical records made under the prior Julian calendar, more if the Julian
calendar was extended prior to its 45-Jan-1 BC adoption to label the historical
event. Select "mixed" calendar mode if correlation with historical dates prior
to A.D. 1582 is important.
NOTE: A time-zone correction has been requested. See header.
NOTE: "n.a." in output means quantity "not available" at the print-time.
SOLAR PRESENCE (OBSERVING SITE)
Time tag is followed by a blank, then a solar-presence symbol:
'*' Daylight (refracted solar upper-limb on or above apparent horizon)
'C' Civil twilight/dawn
'N' Nautical twilight/dawn
'A' Astronomical twilight/dawn
' ' Night OR geocentric ephemeris
LUNAR PRESENCE (OBSERVING SITE)
The solar-presence symbol is immediately followed by a lunar-presence symbol:
'm' Refracted upper-limb of Moon on or above apparent horizon
' ' Refracted upper-limb of Moon below apparent horizon OR geocentric
ephemeris
'L_Ap_Sid_Time,' =
Local Apparent Sidereal Time. The angle measured westward in the body
true-equator of-date plane from the meridian containing the body-fixed
observer to the meridian containing the true Earth equinox (defined by
intersection of the true Earth equator of date with the ecliptic of date).
TOPOCENTRIC ONLY. Units: HH MM SS.ffff (hours-minutes-seconds of time)
Computations by ...
Solar System Dynamics Group, Horizons On-Line Ephemeris System
4800 Oak Grove Drive, Jet Propulsion Laboratory
Pasadena, CA 91109 USA
General site: https://ssd.jpl.nasa.gov/
Mailing list: https://ssd.jpl.nasa.gov/email_list.html
System news : https://ssd.jpl.nasa.gov/horizons/news.html
User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html
Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x
API https://ssd-api.jpl.nasa.gov/doc/horizons.html
command-line telnet ssd.jpl.nasa.gov 6775
e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/horizons_batch.txt
scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS
Author : Jon.D.Giorgini@jpl.nasa.gov
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