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Nguoi Viking di bien trong ngay may nhu the nao?

Nguoi Viking dinh huong tren bien bang nhung chiec dong ho mat troi. Nhung trong nhung ngay u am, dong ho mat troi cung vo ich. Nhieu nha nghien cuu tu hoi ho da vuot qua dieu do bang cach nao? Mot gia thuyet cho rang ho da trong len bau troi bang nhung tinh the da (duoc goi la da mat troi) de tim ra huong di cho minh.

Khong ai kiem nghiem gia thuyet nay cho den gan day. Mot nhom nghien cuu da ra khoi tren bien Bac cuc tren chiec tau pha bang cua Thuy Dien Oden, va phat hien thay da mat troi qua thuc co the chieu sang duong di trong dieu kien may hay suong mu.

Cac tinh the nhu cordierite, calcite hay turmaline hoat dong giong nhu bo loc phan cuc, phat sang va toa mau khi phat hien ra goc mat troi. Dua vao nhung thay doi nay, nguoi Viking co the xac dinh chinh xac diem toi cua anh sang bi phan cuc hoa, va chi ra huong di cua mat troi, Gabor Horvath, tu Dai hoc Eotvos o Budapest cho biet.

"Mac dau tat ca nhung dieu nay moi chi thuan tuy la gia thuyet, song cac nha nghien cuu co the kiem tra kha nang khoa hoc cua viec dinh huong nhu vay", Horvath noi.

 

Loat anh tren cung cho thay bau troi Bac cuc ngay suong mu (a), co nang (b) va co may (c). Loat anh d-f cho thay cac muc do phan cuc hoa anh sang. Loat anh g-i chi ra goc phan cuc hoa. (Anh: LiveScience)

 

Trong nhung cong trinh truoc kia, Horvath va cong su chung to rang nguoi Viking co the da dung den vai loai thiet bi, chu khong chi bang mat thuong, de danh gia chinh xac huong mat troi trong nhung ngay may mu.

Thieu bang chung

Tuy nhien, khong giong nhu dong ho mat troi, cac nha khao co chua tim thay bat cu tan tich nao cua nhung vien da mat troi. Gia thuyet ve loai da nay duoc dua ra lan dau tien nam 1966 boi mot nha khao co hoc Dan Mach. Goi y duy nhat cho thay nguoi Viking tung su dung loai da do bat nguon tu mot truyen thuyet cua dan toc nay, duoc biet den voi ten goi saga.

Cung voi nguoi Viking, chim va buom cung duoc cho la da su dung anh sang phan cuc de dinh huong, ben canh nhung dau vet khac nhu tu truong trai dat.


Hinh anh thuyen Viking. (Anh: LiveScience)

 


Theo LiveScience, VnexpressArticle source http://w4rum.com/885.t

[By Cao Tan Kiet] [03/Mar/07]
 
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