The polar axis of the Sun is inclined 7.15° relative to the plane of the earth's orbit. Consequently, its axis will be sequentially tilted toward the Earth, perpendicular to it, and tilted away from it by the same amount as the Earth moves around it. In addition, the Earth's equatorial plane is inclined 23.5° to its orbital plane. The result of the combination of these inclinations is described by two angles that change as the year progresses. The tilt of the solar axis toward or away from our line of sight is designated by the angle Bo. When the Sun's axis is pointing away from us Bo has positive values. When it is toward us, Bo is negative. The angle the Sun's polar axis makes with the north-south direction in the telescope is designated by P. This is given a positive value if the Sun's polar axis points east of the
north-south direction and negative if it points west. The orientation of the Sun's axis of rotation for different times of the year is shown in Figure 6.4. Use this chart as a reference for determining the orientation of the Sun in your telescope eyepiece.
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