As the student's began shuffling to set up their telescopes Edvard took a few minutes to study his lesson plan. Hearing murmurs of difficulties with finding Mercury and some student's who worked like detectives he decided to step in to maybe clear away the confusion.

"Mercury is the little silver, white and brownish planet that is only visible a little time before dawn and is very close to/ right next to the Sun. How long do you all think it is till dawn?" Edvard asked as he shot a look out of the window at the horizon where then sun should soon come up.

Remembering a comment that the lion prefect had made he added "It can also help if you look for Jupiter or Venus first and then go from one of them to find Mercury like Miss Hollingberry was just explaining..."

"But yes normally Mercury is only visible for a short while at dawn but this is a wizarding school is it not and here anything is possible with the help of magic, right?"

Taking up his wand Edvard said "To help you focus your magical telescopes i'm going to teach you a focus spell for the lens called lens focalis. The wand movement is a swish and then tap motion on the telescope."
Taking out a telescope from the cupboard he demonstrated the wand movement slowly, showing the swish and then tap on the telescope. "lens focalis!" he said firmly. Turning to adress the student's again he said "Practice the incantion first and then test it out on your telescopes. If you've done it right what you see in your telescopes should be more clear and sharp."

OCC: Practice the new focus charm on your telescopes and see if you can find Mercury now with the help of your telescopes and the information I've provided (at dawn it should be visible right next to the sun or you can do as sweetpinkpixie suggested and look for Jupiter or Venus first before locating Mercury).