The time window is shown at the upper left corner of the screen, next to the Start & End labels. When SaVoir is first started the default time period is always selected to be one day starting with the current time in UTC. All time references in SaVoir are in UTC time.
The Advanced Time Selection opens up a dialogue window here allowing us to choose the time periods also using the satellite start and stop orbits.
The times can be edited:
• by hand, as they are text fields, so simply by typing in other times if one wishes to change the default time;
• by opening up the calendar;
• by graphically choosing a new start time. This is done simply by clicking on the desired start date or end date, or by dragging the cursor, both the start and end dates can be selected together.
We can open a menu by clicking on the down arrow next to the start or end label, where we could choose a number of useful functions:
• Previous Period will update the times to have the same duration but ending immediately before the current time window;
• Next Period shifts the time window after the current time window.
• The Current Time option shifts the current time window to start at the current time - always leaving the duration the same.
The Advanced Time Selection opens up a dialogue window. First you’d have to select the satellite that you're interested in. Then, you have to choose the orbit propagation to use for calculating the times and orbit numbers. Here we’ll choose the Sun-Synchronous orbit.
Then as you change the orbit number the start or end date also changes automatically. The duration is shown as number of orbits here, but one could show it in days, for example.
The “Round to Day Boundaries” checkbox can be set to reset the time to zero so that only day boundaries are used.
Regarding time changes we could also go to the Edit menu up here and select time options from the Properties item.
A new dialogue window opens up where we can select the Time settings from the left hand-side under Environment.
Here we have a number of options available regarding time. It displays the current time period and allows you to specify the default time window here.
Here there is the Persistent Time Window. Again when SaVoir starts, the current time is used along with the default time window. With this setting, you may choose to keep the time period from the previous session instead of having it updated every time you open SaVoir.