Download eph file

The positions of the planets for DE agree with the positions on DE to within one meter over the time covered by DE The JPL planetary ephemerides are saved as files of Chebyshev polynomials fit to the Cartesian positions and velocities of the planets, Sun, and Moon, typically in day intervals. The positions are integrated in astronomical units au , but with polynomials stored in units of kilometers.

The integration time units are days of barycentric dynamical time TDB. In DE, similar to DE, the astronomical units has been fixed to the value Most JPL planetary ephemeris files include Chebyshev polynomials fit to the lunar libration angles, which are integrated along with the planetary positions. Many ephemeris files also a fit to the IAU nutation series. While the IAU nutation series is not current, it is maintained in the files for backward compatibility.

Later ephemerides tend to be stored in longer blocks. When converted into binary format, the files can be merged to span a longer time if desired. The machine-dependent binary files differ mainly in the binary representation of numbers. The 'little-endian' representation is used by Intel x86, IA64 or Alpha based processors and their clones. These Fortran programs generally require some tailoring by the user. Referred to the dynamical equator and equinox of Covers JED DE : Created September ; includes nutations but not librations.

This ephemeris was used for the Astronomical Almanac from to See Standish, and Standish, Zipped files tend to require special handling and may require password access. Contact the file owner or the person who gave you the file for the password and unzip the file before attempting to open the contents. On a Mac, select "More info" and "Kind". Because many programs packages utilize Uncommon Files, you might be able to find a program on your computer that handles those types of files.

If that still does not work, you may have to contact the associated software developer to find out how to open it.

Unless you know the specific developer, you could contact one of these developers for assistance. Please see our chart below of software titles and their developers:. Use the Ephemeris Download module to select the protocol for data transfer, and to provide the download address es and the target folder. For redundancy purposes you can specify two different download URLs for predicted orbits.

Additionally, you can specify a connections and target folders for downloading precise orbits as well as Differential Code Bias DCB files.

Tip - To ensure fast loading times of predicted orbit files, Trimble 4D Control Server makes sure that only predicted orbits which are currently needed are fed into the system. Each day, the Ephemeris Download module downloads the SP3 files in user-specified intervals. The time the download starts can be specified in the module properties as well as a repeat interval, if the download has failed. When the module is being added, the Ephemeris Download Properties dialog appears.

It lets you define and select Ephemeris Download module configurations. Each configuration holds a set of settings, such as a protocol or the download target folder. You also may remove a configuration from here, if you do not need it anymore.

If you remove the module while the data download is performed, the data download will be finished first.