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Updated Software and Documentation Resources

December 4, 2014

I should first explain why I have not posted in over two years. During a routine physical exam in October 2012, I was diagnosed with lymphoma. The disease was most likely caused by exposure to Agent Orange in South Viet Nam. The disease makes me tired and I have to rest in the middle of the day. I am thankful for the support of my family, friends and two excellent oncologists.

This post is an update to the location of my aerospace software and documentation. I have moved most of this data to a Dropbox location since I can no longer afford the original website (cancer treatment can be very expensive).

The following are links to the different categories:

Astro Apps

Ephemeris Binary Files

Interplanetary Mission Analysis

Lunar Mission Analysis

Orbital Mechanics with MATLAB

Numerical Prediction of Orbital Events (NPOE)

Celestial Computing with Numerit Pro

Orbital Mechanics with Numerit Pro

Numerical Analysis with Numerit Pro

Aerospace Trajectory Optimization

Technical Reports

Orbital Mechanics with Fortran


I will continue to post updates and new applications to these sites. If you find something missing, please let me know.


From → Uncategorized

  1. Felix Nordhausen permalink

    Dear David,

    When I read your post I became very sad.
    I wish you good health as well as good recovery.

  2. Priyankar permalink

    Dear David,

    I am extremely sad to read your post. I wish you sound health and speedy recovery.


  3. lifan permalink

    Dear David,
    I am first time here ,and sad to read about your post. I wish you could recover your health as soon as possible.
    Li Fan from China Purple Mountain Observatory

  4. Fayssal permalink

    i wish you a speedy recovery

  5. Dear David,

    From UK, I hope you get better soon and continue posting all this excellent information in the Celestial Mechanics field. Get well soon, please!

  6. kartikkumar permalink

    Hi David,

    I’m sorry to read the news about your health and I hope you get well soon. I would be happy to foot the bill for your domain and hosting costs, so you can have all your material on I’ve found your material to be invaluable over the last few years, so it’s the least I can do. If you’d like to take me up on this offer, shoot me an email (me [at] kartikkumar {dot} com

    Wishing you a speedy and full recovery,


  7. TU LIXIN permalink

    Dear David,
    Thank you for all whay you have done.
    I really really wish you good health and speedy recovery

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