sight reduction造句

• Sight reduction tables provide solutions for navigation triangles of integral degree values.
• The first step in sight reduction is to correct the sextant altitude for various errors and corrections.
• When using precomputed sight reduction tables each observation and each body will require a different assumed position.
• The simplest sight reduction is to draw the equal-altitude circle of the sighted celestial object on a globe.
• After some computations, referred to as sight reduction, this measurement is used to plot a example below ).
• "' Written "'- The written examination includes questions on sights and sight reduction and worldwide meteorology.
• Professional navigators are divided in usage between sight reduction tables on the one hand, and handheld computers or scientific calculators on the other.
• As the day passes, one works the sight reductions backwards to develop exact angles for each of the images'tops and bottoms.
• When using precomputed sight reduction tables, such as H . O . 229, the assumed position must be selected to yield integer degree values for " LHA " ( local hour angle ) and latitude.
• Determining a fix by crossing LOPs and advancing LOPs to get running fixes are not specific to the intercept method and can be used with any sight reduction method or with LOPs obtained by any other method ( bearings, etc . ).
• The haversine continues to be used in navigation and has even found new applications in recent decades, like in Bruce D . Stark's method for clearing lunar distances utilizing Gaussian logarithms since 1995 or in a more compact method for sight reduction since 2014.
• Practical celestial navigation usually requires a marine chronometer to measure time, a sextant to measure the angles, an Two nautical ship officers " shoot " in one morning with the sextant, the sun altitude With sight reduction tables, the only calculations required are addition and subtraction.
• If you know the Declination of X ( you can find this in a reference book known as an Almanac ), then with the use of a set of tables known as'Sight Reduction Tables'and some simple mathematics, you can work out your Latitude as accurately as you can measure the vertical angle, or Altitude, of X.