File:Distance from Earth center to Moon center - vi.svg
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DescriptionDistance from Earth center to Moon center - vi.svg |
Tiếng Việt: Khoảng cách từ tâm Trái đất đến tâm Mặt trăng, biến đổi theo thời gian trong năm 2021. Các chấm tròn màu vàng trên đồ thị là các thời điểm trăng tròn. English: Distance from Earth center to Moon center, data from JPL Horizons On-Line Ephemeris System https://ssd.jpl.nasa.gov/horizons.cgi . The overlaying yellow disks represents the time of full moons.
Drawn by the following python3 code: #Download the moon position in geocentric coordinates from https://ssd.jpl.nasa.gov/horizons.cgi with # Ephemeris Type : VECTORS # Target Body : Moon [Luna] [301] # Coordinate Origin : Geocentric [500] # Time Span : Start=2020-10-01, Stop=2022-10-01, Step=1 d # Table Settings : defaults # Display/Output : download/save (plain text file) # and save to moon.txt AU = 149597870.700 import re, math f = open("moon.txt","r") o = [] for line in f: if line[0:2] == " X": t = (re.sub('=+','=',line.strip().replace(" ","="))).split("=") r = AU*math.sqrt(float(t[1])**2 + float(t[3])**2 + float(t[5])**2) o.append(r) f.close() import matplotlib.pyplot as plt plt.rcParams["figure.figsize"] = (14,4) fig, ax = plt.subplots() ax.plot(o[:570],'C1') # using only first 570 days in data # full moon days counting from 2020-10-01, data from # https://lunaf.com/lunar-calendar/2020/ # https://lunaf.com/lunar-calendar/2021/ # https://lunaf.com/lunar-calendar/2022/ fullmoonday = [1,31,61,91,120,149,179,209,238,268,297,326,356,385,415,445,474,504,534,563] fullmoondistance = [] for i in range(len(fullmoonday)): fullmoondistance.append(o[fullmoonday[i]]) ax.scatter(fullmoonday,fullmoondistance,color='y') ax.set_box_aspect(0.2) ax.set_ylabel('khoảng cách (km)') plt.xticks([93,456],['1 tháng 1 năm 2021', '1 tháng 1 năm 2022']) plt.ylim([350000, 415000]) plt.show() #Then export the image to SVG #Then use Inkscape to edit (adding annotations) |
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Source | Own work |
Author | Tttrung |
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current | 04:09, 3 March 2021 | 1,051 × 217 (65 KB) | Tttrung (talk | contribs) | Update font size | |
04:05, 3 March 2021 | 1,051 × 217 (65 KB) | Tttrung (talk | contribs) | Uploaded own work with UploadWizard |
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