Breaking your study session into smaller segments with breaks in between will help increase your retention of the material you’re studying. During your break, stand up, stretch, walk around, or make yourself a cup of tea. Try not to use your phone, check the internet, or watch TV when you take your break. That way, you’ll be able to stay focused on your study session. to boost your concentration and memory. Going for a short walk or jog outside will also help you recharge your batteries and make your study session more effective. Just 20 minutes of exercise can greatly improve your concentration and memory.  Take a short, 20-minute exercise break once every 2 hours or so. Exercising outside is best because the fresh air can also help reenergize you. before the exam. Eating a healthy breakfast the day of your exam is very important. Eating a high-carb, high-fiber food like oatmeal would be best. During the week leading up to your exam, you should also eat a well-balanced diet that includes plenty of fruit, vegetables, and protein. Eating healthy snacks like almonds, fruit, or yogurt while you study can also help keep you refreshed and energized. If you’re cramming for a math test, you may be tempted to stay up all night to study. However, this may do more harm than good. If you’re exhausted, you may even have trouble recalling information that you know. Your brain will be at its best when you are well rested. If you have to wake up at 6:00 a.m., try to be in your bed with the lights out by around 9:30 p.m. That way, you’ll still get a full 8 hours of sleep, even if you can’t fall right asleep.
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One-sentence summary -- Take a short 5 – 10-minute break every 20 – 50 minutes while you’re studying. Exercise Eat healthy, well-balanced meals Get at least 8 hours of sleep the night before your exam.


At noon (12:00 PM by your local standard time), use your sextant to measure the altitude of the sun. The sun’s altitude at noon will vary depending on your latitude and the time of year. For example, if you were at the equator and taking your measurement during the spring or fall equinox, the sun would be exactly 90° overhead at noon. If you were at one of the poles, it would be at exactly 0° (on the horizon). To get an accurate latitude measurement, you’ll need to apply the standard corrections to your reading of the sun’s altitude. If your sextant has any index error (difference between a measurement taken at the horizon and 0°), take it into account. Measure the height of your eye, add it to any additional elevation above sea level, and use the 1.7725’ x √ht (ht being height) formula to correct for dip. Finally, consult the tables in your Nautical Almanac to find the corrections for refraction, semi-diameter, and parallax. Apply the corrections as follows:  Observed altitude of the sun +/- index error (+ if the difference is negative, - if it’s positive) - dip - refraction + semi-diameter + parallax = true altitude of the sun Depending on the position of the sun relative to the equator, you’ll need to either add or subtract the declination from your previous calculation to find your latitude. If the sun is north of the equator, add the declination. If it’s to the south, subtract it.For example, if you got a measurement of 7° 42.7’ after subtracting the sun’s altitude from 90°, and it’s currently April 13, the sun is north of the equator and its declination is 8° 54’. Add 7° 42.7’ + 8° 54’ to get 16° 36.57’. This is your latitude!
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One-sentence summary --
Find the sun’s angle of elevation at its highest point. Make corrections for index error, dip, refraction, semi-diameter, and parallax. Add or subtract the declination of the sun to find your latitude.