[1] Rantaseppä-Helenius began studying mathematics in hopes of becoming a teacher.

Helenius, as a daughter of a farmer, was among the lucky few astronomers that had the privilege of having an observatory at their own corral.

[2] Rantaseppä-Helenius worked on observing minor planets.

She was also involved in building the Kevola Observatory by Tähtitieteellis-optillinen seura (Astronomy-Optical Society) on her own property in 1963.

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