Turn off the daylight and horizon displays. Open the
“Display” Palette on the vertical toolbar and click on the
left side of NGC-IC. Under “Which objects to draw,” be
sure only Globular Clusters is turned on (as indicated by a
check mark in its box). Click Apply and then OK. Set the
field to 45°. Click on the “Goto” button, which is right
under the “Sky” menu at the top of the display. Set right
ascension and declination to 18h, -30°, respectively, and
then click on “Centre.” Count the number of globular
clusters in the field of view. Now center the display 1⁄4 of the
sky away at 12h, 0°. Again count the globular clusters.
Repeat for 6h +30° and 0h 0°. How can you account for
the different numbers of globular clusters seen in different
directions?
