This function displays various astronomical phenomena for a given time period.
Clicking on the table displays the chart for the corresponding date. The program shows a chart centered on the selected object using the entered date and time. If the selected column contains the time for a specific event such as the planet rise or the twilight time, this time is used for the chart. There are more functions for the eclipses and the artificial satellites that are described on the corresponding page.
This screen shows the morning and evening twilight time for each date selected.
Nautical twilight is when the Sun is 12 degrees below the horizon - brighter stars are visible.
Astronomical twilight is when the Sun is 18 degrees below the horizon - the sky is dark and all stars are visible.
Shows the position, magnitude, apparent diameter, illuminated fraction, rise, culmination and set time, and current azimuth and altitude for the Sun, the Moon and the planets for each date displayed on the table.
Shows the position, magnitude, Sun elongation, phase, rise, culmination and set time for the selected comet.
The elevation above horizon and azimuth at twilight time are shown to help observe comets near the Sun. This indicates whether the comet is best viewed in the morning or evening.
Clicking the mouse on the list shows the eclipse from
the current observatory location and puts the program
in animation mode.
Clicking the mouse on the list shows the eclipse from the current observatory location and puts the program in animation mode.
First select the date range for the prediction, the limiting magnitude for the list and to plot to the chart, the TLE file to use for the calculation (use the Ctrl or Shift key to select multiple files). Use the two check boxes on the right if you want to limit the search to the satellites that cross the current chart (useful for avoiding a satellite trail on a long exposure photograph) or if you want to include the Iridium flare to the list.
The TLE file for the Iridium flare must be named iridium.tle. If you want to show the satellite path before and after the flare on the chart you must include this file on the list and select a limiting magnitude of at least 8 for the chart.
After clicking OK, the list shows the following
values: the date and time of maximum elevation, the
satellite name, the maximum magnitude, azimuth and
altitude of the maxima, distance in kilometers, right
ascension and declination, estimated error on the
prediction time in minutes or for the flare the
distance and direction to the flare maximum, and the
direction of the satellite movement.
Clicking on the list shows the chart of this satellite pass but also any other object brighter than the limiting magnitude in a time range of +/- 6 minutes.
Please update the TLE element files regularly (at least every week)using
the "TLE download" button. The files shipped with the program are examples
only. The action of this button is dependent on having the optional TLE_downloader