Fee, Accuracy and Confirmation of Sunrise/Sunset Data

Accuracy of Data

The times of sunset, sunrise, and related data, as quoted on the NRC Herzberg Institute of Astrophysics (NRC-HIA) web pages, are computed using standard scientific formulae, adopted by the national almanac offices of the United States and the United Kingdom and used worldwide. The times computed by our web pages are considered accurate to ±2 minutes, in the time period 1900–2100.

NRC-HIA does not collect or maintain records of solar phenomena such as observed times of sunrise, sunset and twilight. Since the relevant data can be computed for past or future dates to sufficient accuracy, such observations are not routinely made.

Certification of Data

The NRC-HIA can provide a formal written certificate to confirm any astronomical fact that is produced by the computations which are available through this website. The certificate will be signed by a professional astronomer, whose education and qualifications will be stated, and should be useful as legal evidence of the facts.

Fee for Certification

A fee of $340 will be invoiced for each such certificate.

Contact

Requests may be addressed to:

Dr. Jacques Vallée
NRC Herzberg Institute of Astrophysics
5071 West Saanich Road
Victoria, BC, Canada V9E 2E7
E-mail: jacques.vallee@nrc.gc.ca
Fax: +1 (250) 363-0045