Owen Brazell May 12, 2001
>>When creating a trail in Guide, I'd like to be able
>>to place date labels near the tick marks.
>
>You can do it with Guide's text label overlay but it's
>clumsy. I do my labelling with an image editor too.
>
>
>>Also, I've noticed an odd problem with trails. After
>>creating a trail, if I zoom in on it, the trail becomes
>>bent at a sharp angle.
>
>I've seen this too. My guess is that exact positions are
>calculated for each "step time", and then Guide simply draws
>a straight line from step to step. Under some conditions the
>line may fall outside your field of view. It would look
>nicer with a spline routine to draw the line, but they take
>much longer to compute, and then Guide has to keep track
>[pun intended] of all the in-between bits.
>
>Workaround: set the step size to something much smaller than
>your tick interval. For example I do comet trails with a
>daily tick but with a step size of 2 or 4 hours. Or in the
>case of distant objects, a tick every 10 days and a daily
>step size. Effectively this is what a spline fit does
>anyway.
>
>Of course you can exaggerate this problem by fiddling the
>settings. Try Mars with a step size of 30 days...
>
>>
>>A suggestion for a future version of Guide: I'd like to
>>be able to delete individual trails (and DSS images too).
>
>I second that!
>
>
>cheers,
>Fraser Farrell
>
>
>
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