Questions tagged [navigation]

Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.

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2
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1answer
35 views

Why does the latitude of an observer affect the hour angle of a body in Stellarium?

I am using Stellarium for astronomical data to help in studying celestial navigation. While trying to track down a source of errors in my sextant reading or sight reductions I noticed that the local ...
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1answer
83 views

70-year star in Talmud confusing sailors?

I don't know if this question is a good fit for here - it probably wants the non-existent "History of Astronomic Navigation SE", or maybe just "History SE" - but I'll start here: As described in this ...
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41 views

How to calculate local position, knowing the RA and Dec of the center of an image, RPY of the camera, and precise time?

Given a picture of stars - assume it is possible to identify the stars and their Right Ascension (RA) and Declination (Dec). By choosing one near the center of the image (or interpolating RA/Dec to ...
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0answers
75 views

Why does “longitude by chronometer” require first calculating latitude?

I'm studying the history of longitude and Greenwich Time, and I'm currently confused about the "longitude by chronometer" technique. Conceptually, the method seems extremely simple. With a ...
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1answer
146 views

Is it possible to determine an observer's position on Earth from a photo of the night sky and the time of the shot?

To my knowledge, this question can be related to celestial navigation on one hand and to attitude (or orientation) determination from stars direction on the other hand. However the combination of this ...
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0answers
53 views

Can the patterns in the CMB be detected by off-the-shelf antennas/sensors?

I recently wrote a paper (will attach soon if feasible) for an astronomy class that analyzed the usefulness of the Cosmic Microwave Background as a static reference for attitude determination. The ...
3
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2answers
100 views

Where will the planned Deep Space Atomic Clock orbit “after” Earth? [closed]

I've seen multiple sources repeat the information that the Deep Space Atomic Clock will 'at first' orbit Earth, before moving on out of Earth orbit. The Deep Space Atomic Clock (DSAC) is a ...
-3
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1answer
146 views

What's the soonest Oumuamua could return? [closed]

Oumuamua is apparently a cigar-shaped asteroid that recently passed through the solar system on an unusual orbit, exhibiting unexpected acceleration. Oumuamua is known to have fairly minimal powers ...
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2answers
48 views

How to find a deep sky object 1° NE from a given star

I am an amateur so sorry for any misunderstanding. I am trying to find a deep-sky object located 1° north east from the δ Cas star. I am using the Stellarium ...
2
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1answer
450 views

Could pulsar navigation replace GPS

as a follow-up to my previous question I found out that the Voyager Golden record uses a star map of pulsars to precisely show where our solar system is... Is it possible/feasible to base a ...
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1answer
9k views

How does the Moon look like from different latitudes of the Earth?

I have heard, that on the northern hemisphere, you can estimate a direction of south if you imagine a line going through the tips of the border between illuminated and shadowed part of the Moon, and ...
2
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1answer
410 views

Will time that moon crosses meridian always be periodic?

If I observe the moon pass my celestial meridian at a specific north polar clock 'time' will I observe every subsequent passage at ( 'current time' + 13.2* X 'days passed' mod 360* ) ? Does the moon ...
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2answers
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Celestial navigation from scratch

Is it possible to establish one's longitude and latitude by observing the stars? Can you use observations of the stars to find the relative distance between two locations, which would be useful in map-...
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2answers
128 views

When were the horizontal and equatorial celestial coordinate systems invented?

When were the Alt-az system and the RA-dec system first used?
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1answer
287 views

How do we give directions in space?

If I'm on a life boat, in the middle of the ocean, radioing another ship to come pick me up - I'd say something like "I'm 40 kilometers directly east of you." In space, it's not that easy. How do you ...
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1answer
46 views

Has celestial navigation been materially impacted by the imperfect nature of celestial reference frames over time?

In this video on inertial reference frames, it is mentioned that the stars are humanity's best inertial reference frame: the earth experiences a subtle acceleration relative to the sun due to the ...
2
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1answer
259 views

What are the key coordinate systems used in Astronomy, and where are they used?

Wikipedia describes the five following celestial coordinate systems each with rectangular/spherical variants: horizontal equatorial ecliptic galactic supergalactic What are the practical preferred ...
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2answers
342 views

Understanding Earth Tilt, Sun's Position and Lattitude Calculation

I've been trying to figure out how to calculate the latitude of my location with just the shadow of a stick cast by the sun. I am doing this under the assumption that I am stranded in some place with ...
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1answer
173 views

Can Summer Triangle asterism be used for navigation?

I am wondering, whether is it possible to use vega-altair-deneb asterism for navigational purpose? Or if there is any geometric relationship of it with Polaris? Any idea. Thanks
15
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1answer
2k views

Where is Voyager 1 (or 2) going? In which direction?

Knowing it has exited the solar system, is it traveling in the direction of the center of the galaxy, away from it, orbiting it, or maybe even going perpendicular from the disk-shaped galaxy?
14
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2answers
183 views

What azimuth description systems are in use?

For a time, I thought Azimuth is always direction in degrees, 0 for local, geographic north, 90 for east etc. Then, trying to observe moonrise I downloaded an app that gave azimuth in values between (...
14
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1answer
1k views

Navigation using moon phases

How to navigate with possible maximal precision using moon phases? The Moon is the brightest celestial body seen in the night sky, and it is possible to find even through moderate clouds. So it's a ...