# '''Before twilight''', set up a module for your first filter and an exposure time of 1s (do not go below 1s), with 1 repeat.
# For evening twilight, perform [[#Start-up recipe|steps 1-11 of the start-up recipe]] to setup the telescope and facility prior to sunset.
# Click the small grey "On" button below the SAAO CCD image display.
# Shortly before (morning) or after (evening) sunrise/set ~10 minutes after sunset for B) click "Snapshot" → Exposure time = 1s. Click "Ready" to expose.
# Hover the cursor over the top portion of the image display as the image reads out, and read off the count level in the yellow "ADU" box below the image. Assess how the exposure time needs adjusting to maintain counts of 20000-50000 as the sky darkens/brightens.