The planets outside Earth's orbit – sometimes called the superior planets – are best viewed when at opposition.
有时我们称为‘地外行星’的那些在球轨道外的运行的行星，反相是观察它们的最佳的时机。
The planets outside Earth's orbit – sometimes called the superior planets – are best viewed when at opposition.
有时我们称为‘地外行星’的那些在球轨道外的运行的行星，反相是观察它们的最佳的时机。
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