the sun’s position is constant in the sky, then the angle which the lunar declination has appeared to be lowered is 0.03° + 0.55° = 0.58°. This is the parallax angle. London and the “centre of the Earth” are the two locations which the moon was observed from.
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Figure 13
Line Φ represents the angular difference between the moon and the sun, measured to be equal 0.03°
Line Φ represents the angle which the moon has been “lowered” by. In the context and scale of this problem, the angle that the sun itself moved is negligible
Consider the diagram below, showing the Earth and the Moon.
Figure 14
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