Online Calculators
- An online asteroid orbital elements database
- Locations of planetary mean-motion resonances the solar system
- Create a table of sunrise, sunset, transit, and astronomical and civil twilight times for any location
- Create plots of the altitude and azimuth of the Sun throughout the day for a given day at any location
- Make a plot of the Analemma of the Sun for a given location at noon. This analemma plot is somewhat unusual because the horizontal axis represents the offset of the Sun at noon at your location in minutes of time.
- A Julian date converter
Amateur Astronomy
- Solar, planetary, and deep space images I've acquired with an inexpensive achromatic refractor
- How to mitigate scattered light
- My equipment
- Effect on digital solar images of IR blocking and "minus-violet" dielectric filters.
- A list of 139 close binaries representing a challenge for telescopes of 4-6 inch aperture.
A few small projects, utilities, etc.
- Recent projects and other work-related items.
- Asteroids
- Monthly reports
- Aesthetically pleasing images extracted from various projects
- A world time zone map
Other Stuff
- DeerCam! Also, watch a movie (4.2 MB) of a deer and her fawn outside my office window.
- Algebraic Cats!
- KittyKam!
- Keiko's Kittens! My cat, Keiko, rescued from the MCHS, came home with a severe respiratory infection as well as another "condition": she had kittens on the night of September 11/12, 2004. Watch them being born!
- Memo to the household pets
- My encounter with a trojan virus.
- Moind's Fourth Postulate
- Ever wonder what Worf would say if he were a programmer?
- A classic bit of math humor
- Dover Beach
- The APOTD (Astronomy Picture of the Day).
- NOAA East Coast IR Loop
- A glimpse of just how bad light pollution is in the U.S. [from the Defense Meteorological Satellite Program (DMSP)]
- Pictures from the Smithsonian Kite Festival: 2007 2003
- Pictures of some of the 112 Gargoyles at the National Cathedral. These were taken with a digital camera through a small, 8×32 telescope held up to the camera lens by hand.
- Pictures from the 2005 Inaugural Parade day
-
I found this fellow with his head buried in my leg one summer evening.
It's an adult male American Dog tick
(Dermacentor variabilis).
These ticks are known to transmit
Rocky Mountain Spotted Fever
and Tularemia,
but the likelihood of infection is normally small.
Click on the image for a larger, more detailed one. The picture was taken with
a digital camera with a 10× Hastings triplet magnifying lens held by hand
up to the camera lens.
Some days feel just like this, don't they?- Current and near-future sky conditions
near the Naval Observatory: