Deux équations de navigation astronomique - Jean-du-Sud
La technique la plus employée pour convertir un relevé au sextant en position est la méthode Marcq Saint-Hilaire. À sa plus simple ...
tables de conversion
Les résultats de calculs de trigonométrie sphérique sont en pratique consignés dans un ouvrage, soit les <anchor>tables de conversion</anchor> ( Sight Reduction Tables). Ces tables fournissent une hauteur d’astre théorique (notée H_c) et la direction de l’astre sur une carte marine (notée Z_n).
Pub_No_249_Epoch_2025
Pub\_No\_249\_Epoch\_2025

The
Nautical
Almanac

The
free online Nautical Almanac

The world's most complete source of free celestial
navigation
information

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_Pub. No. 249_

_Publication Number 249_

_also known as Ho-249_

Complete
Volumes[Volume\
1](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Pub_No_249_Vol_1_Epoch_2025.pdf)

Stars

**Epoch 2025**

[Volume\
2](https://www.thenauticalalmanac.com/Pub_No_249/Pub_249_Vol_2.pdf)

Lat. 0° to
40°

[Volume\
3](https://www.thenauticalalmanac.com/Pub_No_249/Pub_249_Vol_3.pdf)

Lat. 40° to 89°

**Specific**
**Sections**

Volume
1

Stars

**Epoch 2025**

_Courtesy of Celestai_ _re_

Latitude

- [N\
80° to N 89°](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_80_to_N_89.pdf)

- [N 70° to N 79°](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_70_to_N_79.pdf)

- [N 60° to N 69°](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_60_to_N_69.pdf)

- [N 50° to N 59°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_50_to_N_59.pdf)

- [N 40° to N 49°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_40_to_N_49.pdf)

- [N 30° to N 39°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_30_to_N_39.pdf)

- [N 20° to N 29°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_20_to_N_29.pdf)

- [N 10° to N 19°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_10_to_N_19.pdf)

- [N 1 to N 9°](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_N_1_to_N_9.pdf)

Latitude

- [S 80° to S 89°](https://thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_80_to_S_89.pdf)

- [S 70° to S 79°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_70_to_S_79.pdf)

- [S 60° to S 69°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_60_to_S_69.pdf)

- [S 50° to S 59°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_50_to_S_59.pdf)

- [S 40° to S 49°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_40_to_S_49.pdf)

- [S 30° to S 39°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_30_to_S_39.pdf)

- [S 20° to S 29°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_20_to_S_29.pdf)

- [S 10° to S 19°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_10_to_S_19.pdf)

- [S 1° to S 9°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_S_1 _to_S_9.pdf)

Latitude

- [0°](https://www.thenauticalalmanac.com/Pub_No_249/Vol_1_Epoch_2025/Latitude_0.pdf)

Volume
2 & 3

declinations 0° to 29°

Latitude

- [0° - 9°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_0_to_9.pdf)

- [10° - 19°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_10_to_19.pdf)

- [20° - 29°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_20_to_29.pdf)

- [30° - 39](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_30_to_39.pdf)

- [40° - 49°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_40_to_49.pdf)

- [50° - 59°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_50_to_59.pdf)

- [60° - 69°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_60_to_69.pdf)

- [70° - 79°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_70_to_79.pdf)

- [80° - 89°](https://www.thenauticalalmanac.com/Pub_No_249/Latitude_80_to_89.pdf)

* * *

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