Arriving at the entrance of the observatory, Moon took a deep breath in apprehension. She had walked the entire ground of the residence and the Old Man was nowhere to be found. This was the last place where he could be. She had actually known he was going to be in the observatory, as it was his favorite place to go when he wanted to get some work done.
Moon was just taking her time, to avoid the confrontation; Hence why it was the last place she decided to look.
It's now or never, she thought anxiously. Just ask the questions, get some answers, and get out of there.