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This is a sample of the complete e-mail report. You also get a simplified listing on the web (example).
School Name: Luther Machen Elementary School Class Name: Teacher Name here City: Hampton State: VA Country: USA Daytime Overpasses: Hampton lat= 37.05 N long= 283.71 E spacecraft is - TERRA
universal time local viewing sat azm relative solar satellite position sat da mo year hr mn time zenith fr. north azimuth zenith lat long dir 24 3 2001 15 44 10:44 42.77 99.30 46.08 40.52 35.88 289.92 des 25 3 2001 16 27 11:27 30.83 286.65 125.33 36.27 37.76 279.64 des 26 3 2001 15 32 10:32 55.06 97.98 42.87 41.25 35.47 292.86 des 26 3 2001 17 09 12:09 68.29 292.42 112.86 34.44 40.45 269.64 des 27 3 2001 16 15 11:15 9.89 285.79 129.51 36.36 37.13 282.51 des 28 3 2001 15 20 10:20 63.81 95.81 40.74 42.12 35.24 295.85 des 28 3 2001 16 57 11:57 61.67 290.54 116.18 33.78 39.59 272.42 des 29 3 2001 16 03 11:03 13.65 102.06 49.23 36.65 36.56 285.40 des 30 3 2001 16 45 11:45 52.65 288.64 119.63 33.34 38.79 275.24 des 31 3 2001 15 50 10:50 34.04 100.96 45.33 37.17 36.06 288.31 des ******************************************************************************** The CERES S'COOL Project - Students' Cloud Observations On-Line MS 420, NASA Langley Research Center Hampton, VA 23681-2199 Tel.: (757) 864-5682 Fax.: (757) 864-7996 http://asd-www.larc.nasa.gov/SCOOL/ scool@lists.nasa.gov ********************************************************************************Header
The first five lines identify the school requesting the report. Then a line identifies whether this is for daytime or night-time overpasses. Then the city and latitude/longitude of the site are listed. It should always correspond to your city and lat/long. Note that longitude can be measured either east or west to the 180th meridian (180 degrees) or 0 to 360 degrees East. For example, the longitude of NASA Langley can be reported three different ways: 76 W, or -76 E, or 284 E. The latter method is the one used in the overpass report. The last line of the header identifies the spacecraft whose orbit was computed.Date & Time
The first 3 columns give you the date of the satellite overpass:
- da is the day of the month
- mo is the month (i.e., 4 is April)
- year is the year
The next 3 columns tell you what time (in two ways) the satellite passes over:
- hr is the hour of the day in Universal Time (UT), i.e., at the Greenwich Meridian
- mn is the minute of the hour in UT also. Report Universal Time on your observation report. You may want to keep a second clock set to UT in your classroom.
- local time is the time at which the satellite passes over in your local time, i.e., the time on your watch or clock. This is given on a 24 hour clock. 15h45 means 15 hours and 45 minutes, or 3:45 in the afternoon. This can be either Local Standard Time or Local Daylight Time; depending whether or not Daylight Saving Time is in effect.
There will often, as in this example, be more than one overpass each day. You can pick the most convenient overpass to fit your schedule; or you can use a different overpass time with different classes.
Position
The next 7 columns give information about the positions of the Sun and the satellite. This information is not needed to make an observation, but may be useful if you want to know where the satellite actually is.
- view zenith is measured in degrees. Click here for a definition and picture. With
- sat azm fr. N, the Satellite Azimuth from North, also measured in degrees, it tells you where in the sky to look for the position of the spacecraft. Note that you will most likely not be able to actually see the spacecraft during the day (see the FAQ).
- relative azimuth is the difference between the satellite and solar azimuths from north. See a picture.
- solar zenith is similiar to viewing zenith; but gives the location of the sun. You should be able to see the sun unless the clouds are opaque.
- satellite position is measured in degrees of latitude and longitude. This is the position on the Earth of the point directly below the spacecraft. This will rarely be exactly at your location. The instruments on the satellite scan around as the spacecraft orbits, so they can see a wider area than just the point directly below them.
- sat dir is the satellite direction. asc stands for ascending, which means the satellite is moving from south to north. des stands for descending, meaning the satellite is moving from north to south.
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