Zon Mosaic Pro5 Guide de l'utilisateur télécharger pdf (Page 102)

102 Starry Night User’s Guide

Specifying Frame Rate: By default, when

the time mode is Forward or Backward,

the screen is updated continuously. The

number of updates performed per second

will depend on the speed of your processor

and graphics card. You can also specify the

number of updates per second. To do this,

choose Preferences from the File menu

(Windows) or the

Starry Night menu (Macintosh) and

choose Responsiveness from the dropbox

in the upper left corner of the Preferences

dialog box.

The “Requested Frame Rate” slider and

textbox allows you to set the frame rate,

which is the number of times Starry Night

will update per second. If you run Starry

Night on more than one computer, the

advantage of specifying a requested frame

rate is that any simulations you create

using Starry Night will run at the same

speed on both computers.

Local and Celestial Paths

Objects in our solar system move over

time, relative to the background stars and

galaxies. Several options in Starry Night

allow you to display this motion. Right-

click (Ctrl-click on the Mac) on any

object in the solar system to open the

object’s contextual menu. You will see

options named “Local Path” and “Celestial

Path”. Selecting one of these options

begins to plot the appropriate path for the

object in question. As time advances, this

path will grow. You can turn off the path

by opening the object’s contextual menu

and selecting the path option again.

Note: A path is the trail an object makes

over a period of time. Therefore, if time is

stopped in Starry Night, a path cannot be

displayed.

Local Path: A local path is the apparent

trail an object would make over time, as

seen from your location. The local path of

an object incorporates the object’s actual

motion and the effects of Earth’s rotation

(assuming you are located on Earth).

Celestial Path: A celestial path is the

apparent path an object makes on the

celestial sphere — the trail an object

leaves over time, in relation to the fixed

stars. The celestial path incorporates only

the object’s actual motion and ignores the

effects of Earth’s rotation.

Note: There is no local or celestial path

for an object that you are located on, since

that object doesn’t move in relation to you.

Path Options: By choosing

Options->Path Options from the main

menu, you can customize the way Starry

Night displays local and celestial paths.

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 207 208

Commentaires sur ces manuels

Pas de commentaire