scholarly journals Azimuth method for ship position in celestial navigation

2017 ◽  
Vol 7 ◽  
pp. 55-62 ◽  
Author(s):  
Van-Suong Nguyen ◽  
Nam-Kyun Im ◽  
Quang-Dan Dao
Keyword(s):  
Celestial Navigation

Development of Celestial Navigation by the Ancient Maya

2001 ◽  
Vol 54 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Douglas T. Peck
Keyword(s):  
Ancient Maya ◽  
Celestial Navigation ◽  
Marine Navigation

This paper discusses the knowledge and culture of astronomy possessed by the Maya civilisation and how this might have been used for marine navigation in the 8th Century. Comparison is made with the European view and use of celestial positioning.

Ephemeris Error Correction in Celestial Navigation System Considering Earth’s Precession-Nutation

Optik ◽  
2020 ◽  
pp. 166152
Author(s):  
Bin Gou ◽  
Ke-yu Qi ◽  
Yong-mei Cheng ◽  
Yuan-yuan Xu ◽  
Zhen Sun
Keyword(s):  
Error Correction ◽  
Navigation System ◽  
Celestial Navigation

scholarly journals Sailing the Sea of Open Access: Celestial Navigation or Dead Reckoning?1

Elements ◽  
2020 ◽  
Vol 16 (5) ◽  
pp. 298-300
Author(s):  
Kevin P. Murphy ◽  
Aaron B. Johnson
Keyword(s):  
Open Access ◽  
Dead Reckoning ◽  
Celestial Navigation

scholarly journals Temporal identity establishes columnar neuron morphology, connectivity, and function in a Drosophila navigation circuit

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Luis F Sullivan ◽  
Timothy L Warren ◽  
Chris Q Doe
Keyword(s):  
Transcription Factor ◽  
Central Complex ◽  
Neuronal Diversity ◽  
Neuron Morphology ◽  
Neuron Number ◽  
Developmental Origin ◽  
Celestial Navigation ◽  
Transient Loss ◽  
Control Adult ◽  
And Function

The insect central complex (CX) is a conserved brain region containing 60 + neuronal subtypes, several of which contribute to navigation. It is not known how CX neuronal diversity is generated or how developmental origin of subtypes relates to function. We mapped the developmental origin of four key CX subtypes and found that neurons with similar origin have similar axon/dendrite targeting. Moreover, we found that the temporal transcription factor (TTF) Eyeless/Pax6 regulates the development of two recurrently-connected CX subtypes: Eyeless loss simultaneously produces ectopic P-EN neurons with normal axon/dendrite projections, and reduces the number of E-PG neurons. Furthermore, transient loss of Eyeless during development impairs adult flies’ capacity to perform celestial navigation. We conclude that neurons with similar developmental origin have similar connectivity, that Eyeless maintains equal E-PG and P-EN neuron number, and that Eyeless is required for the development of circuits that control adult navigation.

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