JPL Horizonsis a web app and API for access to up to date and historic information about parameters of the solar system, e.g. orbital parameters. This library is an ultra basic (for now?) interface to the API. It requires you to manually construct tables for the options you want. Best...
Tengaiis a Gem for using theNASA JPL HORIZONS System. It produces emepherides–tables plotting the course of a celestial body over time. The JPL HORIZONS on-line solar system data and ephemeris computation service provides access to key solar system data and flexible production of highly accurate...