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We see that this is 0. The plus and mi- nus signs correspond to setting ant rising, respectively.

Note that the result is independent of the date: What are the radial and tangential velocities and the total velocity?

The tangential velocity is now given by 2.

This is mean solar time. In early February, E. Dur- ing daylight saving time, we must still subtract one hour from these times. So the sidereal time h.karttunen.fundamentxl This is accurate within a couple of minutes. Neglecting the equation of time, the local time T is 52 minutes less than the zonal time. The time of the vernal equinox can vary about one day in either direction from the average.


Therefore the accuracy of the result is roughly 5 min. Since we do not know the year, we use the rough method of Example 2.

The time be- tween January 1 and vernal equinox March 21 is about 70 days. Next, we use 2.

At the same time at Thus the sidereal time is 11 h 14 min 36 s. Where is the northern- most point of the route, and what is its distance from the North Pole?

Fundamental Astronomy 5th ed H. Karttunen

Assume that the radius of the Earth is km. Find the declination of the star and the latitude of the observer.

It was dark now as it becomes dark quickly after the Sun sets in September. He lay against the worn wood of the bow and rested all that he could. He did not know the name of Rigel but he saw it and knew soon they would all be out and he would have all his distant friends.


Citation – Fundamental astronomy – UW-Madison Libraries

Find the ecliptic longitude and latitude of the Sun and the Earth. Find the coordi- nates of Sirius for The precession must also be taken into account. See also the previous exercise. Hannu Karttunen et al. Observations and Instruments Up to the end of the Middle Ages, the most impor-tant means of observation in astronomy was the human eye. It was aided by various mechanical devices to measure the positions.