Flying sailplanes also makes flying into the sun often unavoidable, or at least desirable! Why? Thermals thats why. When your circling in low lift and the wind drift is taking you closer and closer to that bright spot you have to decide if the lift is worth the risk.

I fly with Sunglasses (prescription not the clip-ons) all the time, AND a cap, and I use my left hand to block out the sun. There will be perhaps two 360 turns where the plane disappears behind my hand for a second or so then pops out. I've learned not to adjust the turn when the plane is gone. It helps that I'm flying a GL which is a very stable, hands off, plane. Even so it sometimes pops out where I don't expect it and/or at an attitude that I don't like. Then it's time to re-evaluate the lift vs. risk equation.

Also, where I fly the wind comes mostly out of the south. Therefore I'm invariably launching with the Highstart right into the sun! Even more fun . The left hand goes up to the sun as I throw the plane then hold breath and stop heart for 1/2 second as it goes through the blind spot.

If the thermal is good the next challenge is loosing sight of it as it turns towards me because it's so high up it's invisible when nose-on.