1840

1840 (MDCCCXL), she blein vishee v'ee, ghow toshiaght Jecrean rere yn eaillere Gregoiragh.

Milley bleeaney:	2oo milley bleeaney
Eashyn:	18oo eash 19oo eash 20oo eash
Jeihaghtyn:	1820yn 1830yn 1840yn 1850yn 1860yn
Bleeantyn:	1837 1838 1839 1840 1841 1842 1843

Taghyrtyn

• 21 Jerrey Geuree – Ren Jules Dumont d'Urville feddyn magh Thalloo Adélie 'syn Antarctagh as ren eh aggyrt yn thalloo er son y Rank.
• 6 Toshiaght Arree – Va Conaant Waitangi, chur reiltys Goaldagh ayns bree harrish y Teelynn Noa, fo-screeuit.
• 21 Boaldyn – Va'n Teelynn Noa fogrit magh myr coloin Ghoaldagh.

Ruggyryn

• 18 Jerrey Geuree – Alfred Percy Sinnett, screeudeyr Goaldagh (b. 1921)
• 5 Toshiaght Arree – John Boyd Dunlop, ynlaghteyr Albinagh (b. 1921)
• 29 Toshiaght Arree – John Philip Holland, ynlaghteyr Yernagh yn ovooirane (b. 1914)
• 2 Averil – Émile Zola, screeudeyr Frangagh (b. 1902)
• 7 Boaldyn – Pyotr Ilyich Tchaikovsky, cummeyder Rooshagh (b. 1893)
• 14 Sauin – Claude Monet, peinteyr Frangagh (b. 1926)

Baaseyn

• 25 Averil – Siméon Denis Poisson, maddaghteyr, towse-oayllee, as fishigagh Frangagh (r. 1781)
• 25 Luanistyn – Karl Leberecht Immermann, noaskeealagh as dramadeyr Germaanagh (r. 1796)