User Greg Miller

55 votes

Accepted

In this image taken by Voyager 1, which is closer: the earth or the moon?

distances photography

answered Jul 9 at 19:00

27 votes

Accepted

What could be an explanation for a satellite-like moving light in the night sky that dims over time

answered 2 days ago

19 votes

What is this, red, blue, white twinkling, star?

star night-sky

answered Mar 28 at 1:37

13 votes

Huge galaxies seen from earth

light

answered Jul 3 at 22:07

10 votes

Accepted

Will a 10mm eyepiece with a barlow 2x produce the same result as a 5mm eyepiece?

eyepiece barlow

answered Jul 30 at 19:22

9 votes

Accepted

Does the universe have a celestial north?

cosmology

answered Mar 19 at 17:29

5 votes

Movement of stars over long periods of time

star terminology movement

answered 23 hours ago

4 votes

Accepted

Calculating velocity of Earth from JPL DE

planetary-science ephemeris nasa

answered Mar 2 at 21:11

4 votes

Accepted

Measuring distance to stars - How to get parallax angle

amateur-observing parallax

answered Jun 8 at 12:01

4 votes

How to choose eyepieces and other accessories for a Celestron 70mm f/5.7 portable refractor?

observational-astronomy telescope space telescope-lens eyepiece

answered Apr 10 at 14:31

4 votes

How to find the first Julian day with the same Earth-Sun constellation

algorithm sunrise sunset

answered Jun 3 at 15:11

3 votes

Accepted

What exactly causes "color twinkling" and why does it seem that any color might be furthest refracted for a moment?

observational-astronomy amateur-observing atmospheric-effects

answered Jun 4 at 17:10

3 votes

Accepted

Determining when the sun shines on different sides of a building using astropy

the-sun python astropy

answered Apr 25 at 15:15

3 votes

Azimuth angle and elevation angle of a heliostat mirror

the-sun mathematics azimuth

answered Apr 26 at 2:42

3 votes

What is the closest stellar neighbour to Sirius?

star

answered Mar 29 at 22:05

3 votes

What is the average angular distance between the Sun and the Moon?

the-moon solar-system

answered Apr 9 at 2:05

3 votes

Measurement of Planetary Aberration (similar to stellar aberration)

observational-astronomy time-dilation special-relativity frame-of-reference

answered Jul 25 at 14:46

3 votes

Accepted

Planets positions (azimuth, altitude) API

planet the-moon solar-system positional-astronomy

answered Aug 13, 2019 at 3:20

3 votes

Why can't Level replace Horizon when using a Sextant

amateur-observing

answered Nov 24, 2021 at 23:55

3 votes

What would be 1 hour equivalent on these moons of Jupiter and Saturn compared to earth? And their astrobiological implications

cosmology natural-satellites time-dilation astrobiology galilean-moons

answered 2 days ago

2 votes

Accepted

VSOP for exosatellites? (Io, Titan, Ariel, etc)

positional-astronomy

answered Aug 19, 2019 at 4:57

2 votes

Error when calculating Alt/Az from Ra/Dec

positional-astronomy azimuth

answered Aug 19, 2019 at 5:17

2 votes

Textbook to explain measurements and calculations for heliocentric solar system

solar-system

answered Aug 24, 2019 at 16:58

2 votes

SPICE Alt Az example

coordinate python

answered Sep 1, 2019 at 15:47

2 votes

Deriving the apparent angular speed of a star

star orbital-mechanics declination apparent-motion

answered Mar 23 at 4:49

2 votes

Accepted

First observation that the Sun and Jupiter (and friends) move around a common barycenter?

the-sun solar-system history

answered Sep 1, 2019 at 20:04

2 votes

Accepted

Units in distance parallax relation

parallax units

answered Jul 1 at 16:23

2 votes

How to calculate the Sun's declination for a specific location based on the axial tilt of Earth throughout the year?

earth obliquity

answered Feb 14 at 14:47

2 votes

Comet Bernardinelli-Bernstein; could it be a "planet-killer" and what could prevent it from getting close to us?

orbit solar-system comets collision c2014-un271-bernardinelli-bernstein

answered Apr 14 at 1:30

1 vote

Precision in the measurement of the distance to the Sun

observational-astronomy solar-system ephemeris

answered May 3 at 3:43

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43 Answers

In this image taken by Voyager 1, which is closer: the earth or the moon?

What could be an explanation for a satellite-like moving light in the night sky that dims over time

What is this, red, blue, white twinkling, star?

Huge galaxies seen from earth

Will a 10mm eyepiece with a barlow 2x produce the same result as a 5mm eyepiece?

Does the universe have a celestial north?

Movement of stars over long periods of time

Calculating velocity of Earth from JPL DE

Measuring distance to stars - How to get parallax angle

How to choose eyepieces and other accessories for a Celestron 70mm f/5.7 portable refractor?

How to find the first Julian day with the same Earth-Sun constellation

What exactly causes "color twinkling" and why does it seem that any color might be furthest refracted for a moment?

Determining when the sun shines on different sides of a building using astropy

Azimuth angle and elevation angle of a heliostat mirror

What is the closest stellar neighbour to Sirius?

What is the average angular distance between the Sun and the Moon?

Measurement of Planetary Aberration (similar to stellar aberration)

Planets positions (azimuth, altitude) API

Why can't Level replace Horizon when using a Sextant

What would be 1 hour equivalent on these moons of Jupiter and Saturn compared to earth? And their astrobiological implications

VSOP for exosatellites? (Io, Titan, Ariel, etc)

Error when calculating Alt/Az from Ra/Dec

Textbook to explain measurements and calculations for heliocentric solar system

SPICE Alt Az example

Deriving the apparent angular speed of a star

First observation that the Sun and Jupiter (and friends) move around a common barycenter?

Units in distance parallax relation

How to calculate the Sun's declination for a specific location based on the axial tilt of Earth throughout the year?

Comet Bernardinelli-Bernstein; could it be a "planet-killer" and what could prevent it from getting close to us?

Precision in the measurement of the distance to the Sun