ORC Expert Advisory Services ORC International

  home    |    find an expert    |    request an expert    |    join our network    |    about us     expert login  
Expert Consulting and Expert Witness Services
  search tips 
Share this page:  Send to LinkedIn Send to Facebook Tweet This Email Print

 Expert  722266

Expert in Calculation of Celestial Events and Issues of Natural Lighting

Available for your Consulting and Expert Witness Needs

Maryland (MD)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise:

Listed with other top experts in: 

Expert can perform the necessary calculations to determine the times of moonrise and moonset, moon phase or lunar phases (waxing moon, waning moon, first quarter moon, last quarter moon, full moon, new moon), percent of the moon's surface illuminated, and the position of the moon (altitude and azimuth).


Expert can perform the necessary calculations to determine the times of sunrise and sunset, and sun position (altitude and azimuth). He can also perform the calculations necessary to determine the times of the various twilights (civil twilight, nautical twilight, and astronomical twilight), including clear explanations of the natural light available during twilight periods.




Expert can calculate the quantity of natural light for any location or time. Natural light is the direct or refracted light of the sun as observed from the Earth's surface. Expert notes that the period that refracted light is observed is known as twilight.

natural light


ambient light


visible light

Expert is an expert in the calculation of the times of twilight and presents vivid descriptions of the periods of twilight and the natural light present. Expert notes that twilight is the period when the sun is just below the visible horizon up to 18 degrees below the horizon. "Astronomical twilight" is the least known and has little interest outside the scientific and military communities. "Nautical twilight", as can be seen by its name, is of interest to marine navigators at the time of making observations of stars to determine the ship's location. "Civil twilight" is the best known twilight period and has many applications.


Expert can calculate the position of the sun or moon for any location on the Earth for a specific date/time. Azimuth (and altitude) are terms used to describe the location or position of a celestial body in the sky based upon the observer's location and the date/time. Azimuth is expressed in terms of true compass direction from the observer.


Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Baltimore, Maryland;  Frederick, Maryland;  Gaithersburg, Maryland;  Bowie, Maryland;  Wilmington, Delaware;  Lancaster, Pennsylvania;  and Alexandria, Virginia.

Year   Degree   Subject   Institution  
1992   B.S.   General Studies   University of New York  

Work History:
Years   Employer   Title   Responsibilities

2001 to






Expert calculates the position, rise, or set times of the sun and moon, the times of twilight, and addresses natural lighting conditions for litigation, research, investigations, insurance claims adjustors, special event organizers and film production companies.

1971 to 2001


U.S. Navy


Chief Petty Officer


At the time of his retirement from active Naval Service, Expert held the highest rank of Chief Quartermaster E-7 (Marine Celestial Navigation Specialist).

Career Accomplishments:
Professional Appointments

Expert was Command Chief at the U.S. Naval Observatory.


He was the U.S. Navy speaker at the Nautical Almanac Office Sesquicentennial Symposium (1999).

Selected Publications and Publishers  
 - U.S. Naval Observatory  

Consulting Services:
Selected Consulting Examples:
  • He provided specific natural lighting conditions (civil twilight) for a given location in support of a civil litigation matter.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Expert Witness Experience Summary:
Expert provided certified statements of astronomical data to the State of Missouri Public Defender's Offices in two capital murder matters. Neither issue has been tried at the time of this writing. In one of the cases, Expert provided specific information concerning the phase of the moon and its altitude and azimuth at a given time to prove or disprove an identification issue in the pre-trial deposition of a material witness.
Recent Litigation Client Requests:
  • "Natural lighting expert" for consulting on Request for Natural Lighting.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

Additional Skills and Services:

He developed a 15-minute presentation concerning the issues of sun and moon rise and set, and issues concerning civil twilight as they affect matters of civil or criminal law.


Need the right expert?  We can help!

home       find an expert       request an expert       join our network       about us

Intota is now ORC Expert Advisory Services