After entering the Gulf of California, an eye began to become apparent on visible satellite imagery, and it is estimated Isis attained hurricane status late on September 2.
12.
A three-dimensional position is calculated using messages from four or more visible satellites and referred to the optical astronomy, combines astronomical coordinates and the local gravity vector to get geodetic coordinates.
13.
Visible satellite imagery showed that the depression became increasingly ill-defined and the NHC estimated that the depression degenerated into a trough of low pressure near the Islas Mar�as during the afternoon of June 19.
14.
Pointing to a known satellite position ( for example 19.2�E ) is enough; this position will act as the central point, and the USALS system will then calculate visible satellites position within the offset.
15.
Between 1200 UTC September 14 and 0000 UTC September 15, visible satellite imagery of the vortex revealed a resemblance to a tropical cyclone, with an eye-like feature about 19 miles ( 30 km ) wide.
16.
At 11 am ast, the center of the tropical depression was relocated by visible satellite pictures near latitude 14.5 north, longitude 52.1 west, or about 610 miles ( 980 kilometers ) east of the Lesser Antilles.
17.
Warning responsibility was handed over to Wellington in anticipation of Pete's continued east-southeastward motion, but by 0000 UTC on the 25th, it was clearly evident on visible satellite imagery that the center was back north of the boundary.
18.
At 11 am ast, the center of the tropical depression was relocated by visible satellite pictures near latitude 14 . 5 north, longitude 52 . 1 west, or about 610 miles ( 980 kilometers ) east of the Lesser Antilles.
