I'll equi your noxes.

equinox.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+from datetime import datetime
+from bs4 import BeautifulSoup
+from urllib.request import urlopen
+from subprocess import check_output
+
+atf = '%a %b %d %H:%M:00 %Y'
+
+with urlopen('https://en.wikipedia.org/w/index.php?title=Template:Solstice-equinox') as web:
+    soup = BeautifulSoup(web.read(), 'html.parser')
+
+table = soup.find('table', attrs={'class': 'wikitable'}).find('tbody')
+dates = dict()
+today = datetime.now()
+
+for tr in table.find_all('tr'):
+    try:
+        year = int(tr.find('th').text.strip())
+    except:
+        continue
+    times = [td.text.strip() for td in tr.find_all('td')]
+    for i, m, text in ((0, 3, 'March equinox'), (2, 6, 'June solstice'), (4, 9, 'September equinox'), (6, 12, 'December solstice')):
+        hour, minute = map(int, times[i+1].split(':'))
+        date = datetime(year=year, month=m, day=int(times[i]), hour=hour, minute=minute)
+        if date > today:
+            dates[date.strftime(atf)] = (date.strftime('%H:%M %B %d %Y'), text)
+
+atd = filter(None, check_output(['atq', '-q', 's']).decode().strip().split('\n'))
+atd = set(' '.join(d.split('\t')[1].split(' ')[:-2]) for d in atd)
+
+for date, text in map(dates.get, set(dates) - atd):
+    text = '/home/zgrep/offtopiabday/happy ' + text
+    print(f'Scheduling {text} at {date}.')
+    try:
+        check_output(['at', '-q', 's', date], universal_newlines=True, input=text)
+    except:
+        print('Failed.')