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The The Trans Tasman Occultation Alliance is one of several Observing Sections of the Royal Astronomical Society of New Zealand. It was originally formed as the RASNZ Occultation Section in 1977 to promote all forms of occultation observing throughout Australia, New Zealand and the Southwest Pacific, and to provide a centralised focus for collecting observations and providing news and feedback to members. Current members reside throughout Australia and New Zealand.

The Alliance offers benefits to observers and others interested in occultations throughout Australia, New Zealand and the South Pacific by supporting them to contribute to scientific observatons using occultations to whatever extent possible. These include:

• The comprehensive website which you are currenly visiting. The site provides a wealth of information for anyone interested in the topic of occultations. In particular it lists minor planet occultation predictions, updates and preliminary reductions for minor planet occultations, tables of bright total and grazing occultations for the major cities of Australasia, upcoming occultations of double stars, and much more. It describes how you can contribute, the equipment necessary, where your results go and how you can stay in touch with the occultation community.  Also availabe is a comprehensive manual on how to record and analyse occultations recorded using video.

• Access to the Trans Tasman Occultation Alliance IO group: Many observers use this group to report on observations, plan events, and keep in touch. You can join by sending an automated request email to : TTOA - Trans-Tasman Occultation Alliance
  
• Monthly alerts services by email for minor planet occultations and other events. To subscribe please contact Director.