This is a searchable online database of asteroid orbital elements. The data are from the Lowell Observatory database of asteroid orbital elements.

This page contains a calculator that determines the semimajor axis of an orbit that is in a specified mean-motion resonance with a given planet of the Solar System. Also available are images showing various resonance locations overlayed on semimajor axis distributions of the minor planets.

This is a calculator to create a table of sunrise, sunset, and twilight times for any location.

This is a calculator to generate plots of the altitude above the horizon and azimuth East of North of the Sun throughout the day for a given day at any location. It also calculates sunrise, sunset, and twilight times for that day and location.

This calculator produces a plot of the analemma for the Sun for a given location at noon. This particular analemma plot is somewhat unusual because the horizontal axis represents the offset of the Sun at noon at your location in minutes of time.

This utility converts from calendar date and time to Julian date, and vice versa.