Venera 12 Landing
Venera 12 descends through the Venusian atmosphere and transmits scientific measurements from the surface.
Historical biography archive · Updated 2026-11-03
Roald Sagdeev Biography and Timeline
Follow Roald Sagdeev through 11 dated historical records for Russia.
Roald Sagdeev, historical timeline
A chronological timeline drawn from matching World History Database records.
11Distinct records
1 of 1Page
1978–1985Years on this page
1978
Venera 11 Landing
Venera 11 reaches Venus and returns atmospheric and surface measurements after a successful descent.
1982
Venera 13 Colour Images
Venera 13 returns colour panoramas of the Venusian surface and analyses nearby soil.
Venera 13 Landing
Venera 13 lands on Venus and begins an exceptionally productive surface science session.
Venera 14 Landing
Venera 14 lands on Venus and returns further images and direct measurements of surface material.
1983
Venera 15 Radar Mapping
Venera 15 enters Venus orbit and begins high-resolution radar mapping of the planet's northern hemisphere.
Venera 16 Radar Mapping
Venera 16 joins Venera 15 in radar mapping northern Venus through its permanently opaque cloud cover.
1984
Vega 1 Launch
Vega 1 launches on a dual mission that will deploy a Venus lander and balloon before continuing to Halley's Comet.
Vega 2 Launch
Vega 2 launches with a Venus atmospheric balloon and lander as part of the international Vega programme.
1985
Vega 1 Venus Balloon
Vega 1 releases a balloon that drifts through Venus's cloud layer while measuring winds and atmospheric conditions.
Vega 2 Venus Balloon
Vega 2 deploys a second balloon into Venus's atmosphere, providing additional measurements of cloud-level circulation.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.