Zon Mosaic Pro5 User's Guide Page 123

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Observation Tools 123
Ephemeris values are handy for knowing
where an object will be in the sky at a
particular time. If you are using manual or
digital setting circles, for instance, you can
dial in the generated positional data to
locate an object quickly. For example, if
you are tracking the path of a fast-moving
asteroid as it makes its closest approach to
Earth, your ephemeris table will let you
know exactly where the asteroid will be
during the time period you’ll be observing
it.
The ephemeris generator window has the
following set of controls.
Start/End Time: This allows you to enter a
start and stop date/time for the ephemeris
table.
Time Step: Allows you to specify the time
interval between ephemeride values.
Suppress daytime results: By checking
this box, ephemeris data will only be
generated when the Sun is below the
horizon.
Suppress results if below horizon: By
checking this box, ephemeris data will
only be generated when the target object is
above the horizon.
Show: This list allows you to select the
information to include in your ephemeris
table. By default, Local Time, Azimuth/
Altitude, RA/Dec, Object type and
Constellation are selected.
Exporting values: Pressing the Export
button, will open a dialog window which
will allow you to save the ephemeris table
to a text file.
Note: The ephemeris generator outputs
values specific to your current home
location. If you wish to generate an
ephemeris table for an object at a different
location, you first have to change your
viewing location in Starry Night.
Example: Generating an ephemeris
for Saturn.
First find Saturn.
1Open the Find side pane.
2 Click in the text box at the top of this
pane and type in Saturn.
3 Double-click on Saturn’s name in the list
to center on Saturn. If a dialog box shows
that Saturn is beneath the horizon, choose
View->Hide Horizon.
Then generate the ephemeris
4 To generate a new ephemeris for Sat-
urn, right-click on it (Control-click on a
Macintosh) and select Generate Ephe-
merides from the contextual menu.
5 The Ephemeris Generator window will
open. Enter a start time and end time (a
range of one week will provide a good
example) and select a time step of one
day.
6Uncheck the boxes Suppress Daytime
Results and Suppress Results if Below
Horizon.
7Press the Generate Values button at
the bottom of the window.
To export your data to a text file, press the
Export button.
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