I

ICE IN SPACE - AUSTRALIAN AMATEUR ASTRONOMY
http://www.iceinspace.com.au/index.php?home

IIRO'S DEEPSKY SKETCHES ( Finlândia )
http://kotisivu.mtv3.fi/deepsky/index.htm

IMPACT CALCULATOR
http://simulator.down2earth.eu/

INSTITUT DE MÉCANIQUE CÉLESTE ET DE CALCUL DES ÉPHÉMERIDES
http://www.imcce.fr/

INSTITUTO COPÉRNICO ( Argentina )
http://www.institutocopernico.org/

INSTITUTO DE AERONÁUTICA E ESPAÇO
http://www.iae.cta.br/

INSTITUTO DE ASTRONOMIA, GEOFÍSICA E CIÊNCIAS ATMOSFÉRICAS - IAG
http://www..iag.usp.br/

INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS - INPE
http://www.inpe.br
http://www.das.inpe.br/

INTERNATIONAL AMATEUR-PROFESSIONAL PHOTOELECTRIC PHOTOMETRY
http://www.iappp.org/

INTERNATIONAL ASTRONOMICAL UNION - IAU
http://www.iau.org/

INTERNATIONAL DARK-SKY ASSOCIATION - IDA
http://www.darksky.org/

INTERNATIONAL METEOR ORGANIZATION - IMO
http://www.imo.net/

INTERNATIONAL OCCULTATION TIMING ASSOCIATION - IOTA
http://lunar-occultations.com/iota/iotandx.htm

INTERNATIONAL SIDEWALK ASTRONOMY NIGHT
http://www.sidewalkastronomynight.com/

INTERNATIONAL SPACE STATION- ISS
http://station.nasa.gov

INTERNATIONAL SUPERNOVAE NETWORK - ISN
http://www.supernovae.net/isn.htm

IRISH ASTRONOMICAL ASSOCIATION - IAA
http://www.btinternet.com/~jimmyaquarius

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