DECEA provides the sunrise and sunset tables online, on AISWEB (available at: http://aisweb.decea.mil.br/). The query is performed by the aerodrome location indicator and the user can set the period for which information is wanted. The results are presented in UTC and there is a printing option. The algorithm used for the calculations is available at http://williams.best.vwh.net/sunrise_sunset_algorithm.htm. The following parameters are used:
- Aerodrome coordinates: ARP.
- Zenith: 90 degrees.