The plot shows the airmass of all candidate objects as a function of hour angle and updates automatically every 15 seconds. For reference, the right ascension is also plotted on the top. The plot axes are color coded by time of day. If the sun is above the horizon, the plot axes are yellow. You also see the time to sunset display in the box just below the time. The time of sunset should be good to a few minutes. The axes are light brown during civil twilight (CT). The axes switch to light purple during nautical twilight (NT). Then, during astronomical twilight the axes are a darker purple. During the night, the axes plot as white. If either the sun or moon are high enough in the sky, they will appear on the plot as a large yellow and white filled circle, respectively. The altitude of the sun an moon are shown in the box below the time along with the phase of the moon on its line. In the middle of the night you will see three vertical lines on the plot. The lines are dark cyan on the left and right with a purple line in the middle. The purple line denotes the locate in the sky that is directly opposite of the Sun, or the opposition point. The rates of motion for the objects will be highest when they are near this line. The cyan lines marked the location 30 degrees ahead and behine the opposition point. If you wish to combine search observations with recovery operations, you must work between these two lines. The yellow arcing line on the plot shows the ecliptic. The objects are plotted with various symbols and colors. The objects shown complement the information in the top right information box. Total fields are the total number that satisfy the selection criteria. Any candidate object that has not yet been observed plots as a white hollow diamond. Some objects are shown as hollow purple diamons. These objects are valid to observe but the rate of motion is slow enough that you must wait for the next night to do the second image. Clearly, if you have a one-night observing run these objects are not really useful candidates. The sum of white and purple diamonds are counted for the "Available Fields" number. Objects that have been done once are plotted as blue triangles. These are counted as "In Progress Fields". This type of object also shows the distance it has moved since the first frame in the box with the RA, DEC, and HA. Once the object has moved farther than "MinSep", it plots with a small red dot in the center. This provides a visual clue that the object is ready for the second pass. Note that if you click the "Field" button, the program will automatically select the western-most object that is ready for pass 2. If there are no such objects to select, the selection is not changed. Note that if you select "Pass 1", you only see those objects tagged as "available". If you select "Pass 2", you only see those objects that have been observed once. Selecting "All" lets you see both at the same time.