Copies of the save files for these examples are posted for you in Canvas or can be downloaded here: May 2008 and June 2003.īelow is a composite image created of Mars during the 2003 time period you simulated with Starry Night: I created a saved file using Starry Night Pro Plus, and if you open this document in your version of Starry Night, it will allow you to see the local path of Mars, which makes the phenomenon I want you to observe more obvious. Some of the more expensive versions of Starry Night (Pro and Pro Plus) allow you to turn on the "local path," which just plots a curve showing you the path of an object on the sky. How did the path of Mars differ between the two examples? Again, press play or click on the forward one step button at least a dozen times.
Otherwise, use all of the same settings as you used above.For the second example, open a new Starry Night session and set it to the following:.Press play (or click on the forward one step button at least a dozen times), and you will watch Mars' location change with respect to the stars over the course of a few weeks or a few months.constellation labels and stick figures turned on (if you press "k" on the keyboard, it accomplishes this for you without having to use the menu or options tab).The next day, Sirius will rise four minutes earlier because of the Sun’s eastward drift along the ecliptic. If the Sun happens to be from our point of view in front of a particular star, say Sirius, that star will rise just before dawn only on one day of the year. The heliacal rising of a star is the first day it is visible just before dawn, which is a direct indication of the Sun’s drift with respect to the stars. For example, they carefully studied the heliacal risings and settings of stars and used these to mark dates on their calendars. However, we know that many civilizations in the pre-telescopic era were familiar with the drift of the Sun with respect to the stars. We can’t see the stars during the day, so the Sun’s drift is not obvious to most of us. If you recall from Lesson 1, we discussed that the position of the Sun in the sky appears to drift with respect to the background stars (we didn’t discuss it in depth, but the Moon also drifts with respect to the stars–this should be more obvious because we can observe it night after night!). The five planets: Mercury, Venus, Mars, Jupiter, and Saturn.Prior to the invention of the telescope, an observer could see the following objects with the unaided eye:
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