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Transit of Mercury

The importance of a transit of Mercury - discussed by Allan Chapman of Oxford University

The importance of a transit of Mercury - discussion with Allan Chapman of Oxford University.

All about Leonids with David Asher of Armagh Observatory.

Plus what was happening among the stars and planets in November 1999.

This is a programme from the 成人论坛 World Service Archive and was originally broadcast in 1999.

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14 minutes