4. The longitude, usually determined later by referencing an ephemeris, with the column subdivided into two smaller columns, one for System I, and the other for System II.

5. And finally I record information regarding the magnification and filters used, seeing, and transparency.

After I am finished recording transits for the night, I record any other descriptive notes that I feel will further describe the observations.

Imaging runs with a CCD camera or webcam require their own special data. For webcam imaging, I enter the following information, from left to right:

1. The image number, in order, for the night.

2. The end time, in universal time, for the imaging run.

3. The number of frames accumulated.

4. Total elapsed time for the imaging run.

5. The exposure setting.

6. The gain setting.

8. The seeing.

9. The transparency.

I leave space between these entries so I can enter any other information I feel is necessary; and also so I can come back later and write a comment regarding how the finished image came out, after Registax processing. I also leave room to note the file name.

The use of the logbook is plain common sense. Once you record the necessary data for each type of observation, you can record anything you want or find interesting. It can be the journal of your astronomical life. Get into the habit of always keeping a logbook. Since you are taking the time to go out with equipment and look at the planets or stars anyway, you may as well make a record of it. You never know when the insignificant observation made the night before turns out to be something of great importance, and you are the only one that saw it.

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