The question is a little vague; I'm going to assume you mean full moons.
The synodic period (the time between two full moons) averages 29.53 days, which works out to about 12.4 of them per year. In any given calendar year there are either 12 or 13 full moons.
2014 is a "12 full moons" year; 2015 will have 13.
No planet has 19 moons as of June 2014. Earth has one moon and Mars has two. Mercury and Venus have no moons. The other planets all have more than 20 moons.
Quite often as Jupiter has at least 63 moons including the 4 large Gallilean moons.
during the first and last quarter of the moons gravitational
Venus has no moons
Venus has 0 moons.
There will be a total of 12 Full Moons this year, 2014.
13
17
28
New moons occur every 4 weeks.
12. one every month
At this time (mid-2014), 67 moons of Jupiter are confirmed. They are all in orbits around the planet. None are 'on' it.
Jupiter has 67 known moons - as of 2014.
There are 12 full moons in 2014. These are the dates of those full moons: Thursday, 16 January 2014 Saturday, 15 February 2014 Sunday, 16 March 2014 Tuesday, 15 April 2014 Wednesday, 14 May 2014 Friday, 13 June 2014 Saturday, 12 July 2014 Sunday, 10 August 2014 Tuesday, 9 September 2014 Wednesday, 8 October 2014 Thursday, 6 November 2014 Saturday, 6 December 2014
Currently (March, 2014), 63 have been confirmed.
about 5 times a year, during the new moons
On average, one seventh of the full moons occur on a Friday.