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Launch of Vega 1
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Period: to
Vega 1 travels from Earth to Venus
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Launch of Vega 2
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Period: to
Vega 2 travels from Earth to Venus
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Vega 1 reaches Venus
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Period: to
Vega 1 travels from Venus to Halley's Comet
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Vega 2 reaches Venus
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Period: to
Vega 2 travels from Venus to Halley's Comet
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Vega 1 encounters Halley's Comet
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Vega 2 encounters Halley's Comet
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Vega 1 & 2 encounter Halley's Comet a second time