What two phases of the moon cause the strongest tides? full and new quarter and new half and full

How many countries have portuguese as a national language?

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

5. there were nearly 1,000 pirate attacks between 1994 and 2005 off the coast of according to the international maritime bureau's annual piracy report for 2005.