script to create and set wallpaper to photos taken from Nasa's EPIC API

earth.sh

#!/bin/bash

TYPE="natural" # natural or enhanced https://epic.gsfc.nasa.gov/about

declare -i XRES=1920
declare -i YRES=1080
declare -i E_RADIUS=$(($YRES * 80 / 100))
DIR=~/.wallpaper

TIMEOFFSET=3 # 3 days in the past (service runs 1-2 days behind + time difference)

XOFFSET=$(( $XRES / 2 - $E_RADIUS / 2))
YOFFSET=$(( $YRES / 2 - $E_RADIUS / 2))

MONTH=$(date --date="${dataset_date} -$TIMEOFFSET day" +%m)
DAY=$(date --date="${dataset_date} -$TIMEOFFSET day" +%d)
YEAR=$(date --date="${dataset_date} -$TIMEOFFSET day" +%Y)

CURRENTEPOCTIME=`date +"%s"`

DATAURL=https://epic.gsfc.nasa.gov/api/$TYPE/date/$YEAR-$MONTH-$DAY


if [ ! -d $DIR ]; then
  mkdir $DIR
fi

NAME=$(curl --silent $DATAURL | jq -r '.[0].image')
IMAGEURL=https://epic.gsfc.nasa.gov/archive/$TYPE/$YEAR/$MONTH/$DAY/png/$NAME.png

curl --silent $IMAGEURL -o $DIR/cover.png

convert $DIR/cover.png \
  -blur 0x16 \
  -modulate 90,120,100 \
  -resize ${XRES}x${YRES}^ \
  -gravity center \
  -extent ${XRES}x${YRES} \
  $DIR/cover_blurred.png

convert $DIR/cover.png \
  -resize ${E_RADIUS}x${E_RADIUS}^ \
  -background none -fuzz 15% -transparent black \
  -alpha set -virtual-pixel transparent \
  -channel A -blur 0x2 -level 20%,100% +channel \
  $DIR/cover_s.png

rm $DIR/background*

magick $DIR/cover_blurred.png $DIR/cover_s.png \
 -compose over \
 -geometry +$XOFFSET+$YOFFSET \
 -composite $DIR/background-$CURRENTEPOCTIME.png

gsettings set org.gnome.desktop.background picture-uri "file:///"$DIR/background-$CURRENTEPOCTIME.png

Requires ImageMagick.

Also if not using gnome, you can use feh to set the current background in most x11 systems