A person is seen standing before a ping pong table. the man

then hits the ball to the other.

People play croquet in the field. A man hits a long shot down a slope. A wedding procession walks though the field. a man

hits the ball through multiple gates in a row and finally hits the post.

How to treat mild altitude illness 
Descend to a lower altitude. 
If you start to experience any symptoms of mild altitude sickness, such as a headache, lightheadedness, or lung pain, you should descend by at least 500 m or 1 , 600 feet. This will give your body time to acclimatize to the altitude and relieve your symptoms.

You should avoid attempting to go to higher altitudes for two to three days, or until your symptoms have disappeared. Severe altitude sickness can be fatal, so if you notice your symptoms getting worse, make sure you descend to a much lower height.

How to use a sextant 
Know, if possible, your position above sea level. 
If you're not using the sextant from aboard a ship at sea, you'll have to correct your sighting for your height above sea level. We'll discuss the correction later; for now, you just need to know your elevation above sea level.


Sight the horizon by looking through the horizon mirror. The horizon mirror is only partially silvered, allowing you to look through it and through the sighting scope beyond it.