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Bate, Mueller, and White - Fundamentals of Astrodynamics ... - UL FGG

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32 TWO-BODY ORBITAL MECHANICS Ch . 1<br />

Figure 1.7-2 Horizontal component <strong>of</strong> v<br />

But from elementary calculus we know that the differential element <strong>of</strong><br />

area, d A, swept out by the radius vector as it moves through an angle,<br />

d v, is given by the expression<br />

Figure 1.7-3 Differential element <strong>of</strong> area<br />

So, we can rewrite equation (1.7-6) as<br />

2<br />

dt = 11 dA. (1.7-7)

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