| 31. | Finding the distance of closest approach of two ellipses involves solving a quartic equation.
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| 32. | It came to perihelion ( closest approach to the Sun ) in December 1998.
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| 33. | The Russians agreed to the close approach on three conditions.
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| 34. | The multiple discoveries were probably due to its very close approach distance to Earth.
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| 35. | Its closest approach to Jupiter takes place Dec . 30.
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| 36. | By the spring of 1997, it should reach its closest approach to our sun.
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| 37. | The asteroid frequently makes close approaches to Earth and Mars.
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| 38. | Aug . 28 : Mars makes an extraordinarily close approach.
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| 39. | When habituated to human presence, they may tolerate close approach.
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| 40. | On 2003-Aug-16 Illapa made of close approach to Earth of.
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