Harnessing the awesome power of the sun can be a little tricky, because, well, it's a ball of hot plasma with a mass 330K times that of Earth. So sure, you're going to need a little bit of finesse -- and patience -- and reverence, because the sun's just out there doing its thing; you're the one trying to control its mighty brilliance to light your little project, earthling.
But this tutorial from RocketJump Film School might aid you on your mission:
Okay, let's brief:
Objective #1: Track the sun's movements
The sun is a wily foe, so being one step ahead of it can let you plan your attack and get into position before it's upon you. Luckily, you can do a little recon to find out where it will be when you start shooting.
Ideal Weapon: Sun-tracking apps
Objective #2: "Know thine enemy"
Is it a coincidence that the name of the Chinese general who said this is Sun Tzu? Yes, but he's right. Knowing who or what you're dealing with will help you come up with the right tactics to effectively deal with them. The sun is a different adversary depending on where it is in the sky, the weather, and your location.
Ideal Weapon: Educate yourself on the Sun's effects during sunset, high noon, and magic hour
Objective #3: Prepare for your counterattack
Since you'll never be able to control the sun, you'll have to use its power against it. This means finding a way to reflect its light back onto your subject exactly where you need it. Noon, for example, is one of the most difficult times of day to shoot outdoors, because the sun is giving off harsh light directly above your subject resulting in hard shadows, "raccoon eyes", and a bunch of other issues.
Ideal Weapon: Bounce cards, white sheets, etc.
Debrief
Shooting outside is a difficult undertaking, but that shouldn't scare you away from the fight. Come prepared: know where the sun's going to be, understand the lighting effects it'll have at different times, and bring a bounce.
Source: RocketJump Film School
