The limiting magnitude must be entered on the data sheet . below is a table listing the magnitudes of the major stars in the constellation ursa minor 在填写记录表的时候，需要填上当时可见到的最暗星等，附图为小熊座各主星及其星等，可作为参考之用。
In astrometry , the term is applied to the difference between the observed position ( or magnitude ) of a reference star and the position ( or magnitude ) listed in the star catalog 在天文上，本术语指的是观测的参考星的位置（或星等）与星表上的该星的位置（或星等）的差值。
Two stars have the same absolute magnitude . one is thousand times farther away than the other . what is the difference in apparent magnitudes ? which magnitude larger 两颗星具有相同的绝对星等，其中的一颗比另一颗距离远1000倍，它们的目视星等有何不同？哪一个的星等数值大？
Comet mcnaught , estimated at magnitude - 2 ( minus two ) , was caught by the comet ' s discoverer in the above image just after sunset last friday from siding spring observatory in australia 藉由这张澳洲塞汀泉天文台那位彗星的发现者在上星期五黄昏后所拍摄的照片估计，麦克诺特彗星的亮度大约是- 2个星等。
Experienced amateurs can do a lot more . this includes recording the meteors paths and their lengths , the magnitudes , colours , the presence of trains and their durations , etc . observers can work in pairs 对于较有经验的观测同好来说，可尝试进行较复杂的工作，如记下流星的轨迹其长度星等颜色过后是否留有痕迹延续时间等。
The longer the period , the brighter the star is . thus , by measuring the period of a cepheid variable , we know its absolute magnitude , hence , we can tell how far it is away by comparing with its apparent magnitude 所以，只要知道某一造父变星的周期，我们便可得知它的绝对星等，只要和它的视星等作比较，便可以求得它和我们的距离。
A typical red supergiant could be about 100 times larger than the red giant . its surface temperature is low while the total luminosity remains high , with absolute magnitude up to - 10 comparing to 4 . 8 of our sun 典型的超红巨星比普通红巨星大上100倍，虽然表面温度低，但整体光度仍然非常高，绝对星等可达- 10太阳的绝对星等只有4 . 8 。
Recent brightness estimates had comet mcnaught brighter than magnitude - 5 ( minus five ) over this past weekend , making it the brightest comet since comet ikeya - seki in 1965 , which was recorded at - 7 ( minus seven ) 最新的亮度估计显示出在上个周末，麦克诺特彗星的亮度已经比- 5星等还亮，这是自1965年池谷-关彗星(记录上的亮度是- 7星等)以来最明亮的一颗彗星。
Stationary photography should be supplemented with visual observation . by comparing these two sets of data , we can deduce the exact positions where the meteors appear , and the magnitude of the faintest meteors that are captured 摄影要与目视观测互相配合，记下同一天区的流星资料，以便进行比较，可从底片上倒算出其实际位置，又可得知被拍到的流星的最暗星等。
Marks orchestrations can be heard in the academy award nominated scores to dances with wolves , men in black , good will hunting , and in the blockbusters spiderman , sister act , sleepless in seattle , mission impossible and lilo and stitch 他曾参与配乐的电影，包括提名金像奖的：与狼共舞黑超特工队骄阳似我另外还有百视达里的蜘蛛侠修女也疯狂缘份的天空职业特工队小魔星等。
